diff --git a/Modules/Core/Common/include/itkImageBase.h b/Modules/Core/Common/include/itkImageBase.h
index c4d840da9ec..5df26864d02 100644
--- a/Modules/Core/Common/include/itkImageBase.h
+++ b/Modules/Core/Common/include/itkImageBase.h
@@ -249,7 +249,8 @@ class ITK_TEMPLATE_EXPORT ImageBase : public DataObject
    *
    */
   virtual void
-  Allocate(bool initialize = false);
+  Allocate(bool itkNotUsed(initialize) = false)
+  {}
 
   /** Allocates the pixel buffer of the image, zero-initializing its pixels. `AllocateInitialized()` is equivalent to
    * `Allocate(true)`. It is just intended to make the code more readable. */
diff --git a/Modules/Core/Common/include/itkImageBase.hxx b/Modules/Core/Common/include/itkImageBase.hxx
index 0909730472f..9b6e92cf990 100644
--- a/Modules/Core/Common/include/itkImageBase.hxx
+++ b/Modules/Core/Common/include/itkImageBase.hxx
@@ -37,13 +37,6 @@
 
 namespace itk
 {
-
-template <unsigned int VImageDimension>
-void
-ImageBase<VImageDimension>::Allocate(bool)
-{}
-
-
 template <unsigned int VImageDimension>
 void
 ImageBase<VImageDimension>::Initialize()
diff --git a/Modules/Numerics/FEM/include/itkFEMSolver.h b/Modules/Numerics/FEM/include/itkFEMSolver.h
index 9b1b6599fe1..e121b01daf3 100644
--- a/Modules/Numerics/FEM/include/itkFEMSolver.h
+++ b/Modules/Numerics/FEM/include/itkFEMSolver.h
@@ -141,7 +141,8 @@ class ITK_TEMPLATE_EXPORT Solver : public ProcessObject
    * \param dt New time step.
    */
   virtual void
-  SetTimeStep(Float dt);
+  SetTimeStep(Float itkNotUsed(dt))
+  {}
 
   /** Returns the Solution for the specified nodal point. */
   Float
diff --git a/Modules/Numerics/FEM/include/itkFEMSolver.hxx b/Modules/Numerics/FEM/include/itkFEMSolver.hxx
index fd30babeb04..33e8aad9f6d 100644
--- a/Modules/Numerics/FEM/include/itkFEMSolver.hxx
+++ b/Modules/Numerics/FEM/include/itkFEMSolver.hxx
@@ -107,11 +107,6 @@ Solver<VDimension>::GetTimeStep() const -> Float
   return Float{};
 }
 
-template <unsigned int VDimension>
-void
-Solver<VDimension>::SetTimeStep(Float itkNotUsed(dt))
-{}
-
 template <unsigned int VDimension>
 auto
 Solver<VDimension>::GetSolution(unsigned int i, unsigned int which) -> Float
diff --git a/Modules/Segmentation/LevelSetsv4/include/itkLevelSetEquationAdvectionTerm.h b/Modules/Segmentation/LevelSetsv4/include/itkLevelSetEquationAdvectionTerm.h
index 5cded8a0904..51d28c759c8 100644
--- a/Modules/Segmentation/LevelSetsv4/include/itkLevelSetEquationAdvectionTerm.h
+++ b/Modules/Segmentation/LevelSetsv4/include/itkLevelSetEquationAdvectionTerm.h
@@ -118,13 +118,15 @@ class ITK_TEMPLATE_EXPORT LevelSetEquationAdvectionTerm : public LevelSetEquatio
 
   /** \todo to be documented. */
   void
-  Initialize(const LevelSetInputIndexType &) override;
+  Initialize(const LevelSetInputIndexType &) override
+  {}
 
   /** Supply updates at pixels to keep the term parameters always updated */
   void
-  UpdatePixel(const LevelSetInputIndexType & iP,
-              const LevelSetOutputRealType & oldValue,
-              const LevelSetOutputRealType & newValue) override;
+  UpdatePixel(const LevelSetInputIndexType & itkNotUsed(iP),
+              const LevelSetOutputRealType & itkNotUsed(oldValue),
+              const LevelSetOutputRealType & itkNotUsed(newValue)) override
+  {}
 
 protected:
   LevelSetEquationAdvectionTerm();
diff --git a/Modules/Segmentation/LevelSetsv4/include/itkLevelSetEquationAdvectionTerm.hxx b/Modules/Segmentation/LevelSetsv4/include/itkLevelSetEquationAdvectionTerm.hxx
index 4904b9753a3..74529cfa6f5 100644
--- a/Modules/Segmentation/LevelSetsv4/include/itkLevelSetEquationAdvectionTerm.hxx
+++ b/Modules/Segmentation/LevelSetsv4/include/itkLevelSetEquationAdvectionTerm.hxx
@@ -118,19 +118,6 @@ LevelSetEquationAdvectionTerm<TInput, TLevelSetContainer>::GenerateAdvectionImag
   }
 }
 
-template <typename TInput, typename TLevelSetContainer>
-void
-LevelSetEquationAdvectionTerm<TInput, TLevelSetContainer>::Initialize(const LevelSetInputIndexType &)
-{}
-
-template <typename TInput, typename TLevelSetContainer>
-void
-LevelSetEquationAdvectionTerm<TInput, TLevelSetContainer>::UpdatePixel(
-  const LevelSetInputIndexType & itkNotUsed(iP),
-  const LevelSetOutputRealType & itkNotUsed(oldValue),
-  const LevelSetOutputRealType & itkNotUsed(newValue))
-{}
-
 template <typename TInput, typename TLevelSetContainer>
 auto
 LevelSetEquationAdvectionTerm<TInput, TLevelSetContainer>::AdvectionSpeed(const LevelSetInputIndexType & iP) const
diff --git a/Modules/Segmentation/LevelSetsv4/include/itkLevelSetEquationBinaryMaskTerm.h b/Modules/Segmentation/LevelSetsv4/include/itkLevelSetEquationBinaryMaskTerm.h
index 5d89f5ebbc1..f0bc4dcaa4b 100644
--- a/Modules/Segmentation/LevelSetsv4/include/itkLevelSetEquationBinaryMaskTerm.h
+++ b/Modules/Segmentation/LevelSetsv4/include/itkLevelSetEquationBinaryMaskTerm.h
@@ -94,13 +94,15 @@ class ITK_TEMPLATE_EXPORT LevelSetEquationBinaryMaskTerm : public LevelSetEquati
 
   /** Initialize term parameters in the dense case by computing for each pixel location */
   void
-  Initialize(const LevelSetInputIndexType & iP) override;
+  Initialize(const LevelSetInputIndexType & itkNotUsed(iP)) override
+  {}
 
   /** Supply updates at pixels to keep the term parameters always updated */
   void
-  UpdatePixel(const LevelSetInputIndexType & iP,
-              const LevelSetOutputRealType & oldValue,
-              const LevelSetOutputRealType & newValue) override;
+  UpdatePixel(const LevelSetInputIndexType & itkNotUsed(iP),
+              const LevelSetOutputRealType & itkNotUsed(oldValue),
+              const LevelSetOutputRealType & itkNotUsed(newValue)) override
+  {}
 
 protected:
   LevelSetEquationBinaryMaskTerm();
diff --git a/Modules/Segmentation/LevelSetsv4/include/itkLevelSetEquationBinaryMaskTerm.hxx b/Modules/Segmentation/LevelSetsv4/include/itkLevelSetEquationBinaryMaskTerm.hxx
index 7ce57591ca2..fd3b256e8be 100644
--- a/Modules/Segmentation/LevelSetsv4/include/itkLevelSetEquationBinaryMaskTerm.hxx
+++ b/Modules/Segmentation/LevelSetsv4/include/itkLevelSetEquationBinaryMaskTerm.hxx
@@ -38,20 +38,6 @@ LevelSetEquationBinaryMaskTerm<TInput, TLevelSetContainer>::InitializeParameters
 }
 
 
-template <typename TInput, typename TLevelSetContainer>
-void
-LevelSetEquationBinaryMaskTerm<TInput, TLevelSetContainer>::Initialize(const LevelSetInputIndexType & itkNotUsed(index))
-{}
-
-
-template <typename TInput, typename TLevelSetContainer>
-void
-LevelSetEquationBinaryMaskTerm<TInput, TLevelSetContainer>::UpdatePixel(
-  const LevelSetInputIndexType & itkNotUsed(index),
-  const LevelSetOutputRealType & itkNotUsed(oldValue),
-  const LevelSetOutputRealType & itkNotUsed(newValue))
-{}
-
 template <typename TInput, typename TLevelSetContainer>
 auto
 LevelSetEquationBinaryMaskTerm<TInput, TLevelSetContainer>::Value(const LevelSetInputIndexType & index)
diff --git a/Modules/Segmentation/LevelSetsv4/include/itkLevelSetEquationCurvatureTerm.h b/Modules/Segmentation/LevelSetsv4/include/itkLevelSetEquationCurvatureTerm.h
index 68ca7a7e4bf..52dd4336b43 100644
--- a/Modules/Segmentation/LevelSetsv4/include/itkLevelSetEquationCurvatureTerm.h
+++ b/Modules/Segmentation/LevelSetsv4/include/itkLevelSetEquationCurvatureTerm.h
@@ -117,13 +117,15 @@ class ITK_TEMPLATE_EXPORT LevelSetEquationCurvatureTerm : public LevelSetEquatio
 
   /** Initialize term parameters in the dense case by computing for each pixel location */
   void
-  Initialize(const LevelSetInputIndexType &) override;
+  Initialize(const LevelSetInputIndexType &) override
+  {}
 
   /** Supply updates at pixels to keep the term parameters always updated */
   void
-  UpdatePixel(const LevelSetInputIndexType & iP,
-              const LevelSetOutputRealType & oldValue,
-              const LevelSetOutputRealType & newValue) override;
+  UpdatePixel(const LevelSetInputIndexType & itkNotUsed(iP),
+              const LevelSetOutputRealType & itkNotUsed(oldValue),
+              const LevelSetOutputRealType & itkNotUsed(newValue)) override
+  {}
 
 protected:
   LevelSetEquationCurvatureTerm();
diff --git a/Modules/Segmentation/LevelSetsv4/include/itkLevelSetEquationCurvatureTerm.hxx b/Modules/Segmentation/LevelSetsv4/include/itkLevelSetEquationCurvatureTerm.hxx
index 66aca56d6af..e6f2520e9a0 100644
--- a/Modules/Segmentation/LevelSetsv4/include/itkLevelSetEquationCurvatureTerm.hxx
+++ b/Modules/Segmentation/LevelSetsv4/include/itkLevelSetEquationCurvatureTerm.hxx
@@ -76,19 +76,6 @@ LevelSetEquationCurvatureTerm<TInput, TLevelSetContainer, TCurvatureImage>::Init
   }
 }
 
-template <typename TInput, typename TLevelSetContainer, typename TCurvatureImage>
-void
-LevelSetEquationCurvatureTerm<TInput, TLevelSetContainer, TCurvatureImage>::Initialize(const LevelSetInputIndexType &)
-{}
-
-template <typename TInput, typename TLevelSetContainer, typename TCurvatureImage>
-void
-LevelSetEquationCurvatureTerm<TInput, TLevelSetContainer, TCurvatureImage>::UpdatePixel(
-  const LevelSetInputIndexType & itkNotUsed(iP),
-  const LevelSetOutputRealType & itkNotUsed(oldValue),
-  const LevelSetOutputRealType & itkNotUsed(newValue))
-{}
-
 template <typename TInput, typename TLevelSetContainer, typename TCurvatureImage>
 auto
 LevelSetEquationCurvatureTerm<TInput, TLevelSetContainer, TCurvatureImage>::Value(const LevelSetInputIndexType & iP)
diff --git a/Modules/Segmentation/LevelSetsv4/include/itkLevelSetEquationLaplacianTerm.h b/Modules/Segmentation/LevelSetsv4/include/itkLevelSetEquationLaplacianTerm.h
index 80c7527bc84..ce2af5a219d 100644
--- a/Modules/Segmentation/LevelSetsv4/include/itkLevelSetEquationLaplacianTerm.h
+++ b/Modules/Segmentation/LevelSetsv4/include/itkLevelSetEquationLaplacianTerm.h
@@ -101,13 +101,15 @@ class ITK_TEMPLATE_EXPORT LevelSetEquationLaplacianTerm : public LevelSetEquatio
 
   /** \todo to be documented. */
   void
-  Initialize(const LevelSetInputIndexType &) override;
+  Initialize(const LevelSetInputIndexType &) override
+  {}
 
   /** Supply updates at pixels to keep the term parameters always updated */
   void
-  UpdatePixel(const LevelSetInputIndexType & iP,
-              const LevelSetOutputRealType & oldValue,
-              const LevelSetOutputRealType & newValue) override;
+  UpdatePixel(const LevelSetInputIndexType & itkNotUsed(iP),
+              const LevelSetOutputRealType & itkNotUsed(oldValue),
+              const LevelSetOutputRealType & itkNotUsed(newValue)) override
+  {}
 
 protected:
   LevelSetEquationLaplacianTerm();
diff --git a/Modules/Segmentation/LevelSetsv4/include/itkLevelSetEquationLaplacianTerm.hxx b/Modules/Segmentation/LevelSetsv4/include/itkLevelSetEquationLaplacianTerm.hxx
index cc22df66bb1..0ab5597ca80 100644
--- a/Modules/Segmentation/LevelSetsv4/include/itkLevelSetEquationLaplacianTerm.hxx
+++ b/Modules/Segmentation/LevelSetsv4/include/itkLevelSetEquationLaplacianTerm.hxx
@@ -36,19 +36,6 @@ LevelSetEquationLaplacianTerm<TInput, TLevelSetContainer>::InitializeParameters(
   this->SetUp();
 }
 
-template <typename TInput, typename TLevelSetContainer>
-void
-LevelSetEquationLaplacianTerm<TInput, TLevelSetContainer>::Initialize(const LevelSetInputIndexType &)
-{}
-
-template <typename TInput, typename TLevelSetContainer>
-void
-LevelSetEquationLaplacianTerm<TInput, TLevelSetContainer>::UpdatePixel(
-  const LevelSetInputIndexType & itkNotUsed(iP),
-  const LevelSetOutputRealType & itkNotUsed(oldValue),
-  const LevelSetOutputRealType & itkNotUsed(newValue))
-{}
-
 template <typename TInput, typename TLevelSetContainer>
 auto
 LevelSetEquationLaplacianTerm<TInput, TLevelSetContainer>::LaplacianSpeed(
diff --git a/Modules/Segmentation/LevelSetsv4/include/itkLevelSetEquationOverlapPenaltyTerm.h b/Modules/Segmentation/LevelSetsv4/include/itkLevelSetEquationOverlapPenaltyTerm.h
index 67ca32067c0..5d5ae559bd4 100644
--- a/Modules/Segmentation/LevelSetsv4/include/itkLevelSetEquationOverlapPenaltyTerm.h
+++ b/Modules/Segmentation/LevelSetsv4/include/itkLevelSetEquationOverlapPenaltyTerm.h
@@ -103,7 +103,8 @@ class ITK_TEMPLATE_EXPORT LevelSetEquationOverlapPenaltyTerm
 
   /** Initialize term parameters in the dense case by computing for each pixel location */
   void
-  Initialize(const LevelSetInputIndexType & index) override;
+  Initialize(const LevelSetInputIndexType & itkNotUsed(index)) override
+  {}
 
   /** Compute the sum of Heaviside functions in the multi-levelset cases
    *  except the current levelset */
@@ -112,9 +113,10 @@ class ITK_TEMPLATE_EXPORT LevelSetEquationOverlapPenaltyTerm
 
   /** Supply updates at pixels to keep the term parameters always updated */
   void
-  UpdatePixel(const LevelSetInputIndexType & index,
-              const LevelSetOutputRealType & oldValue,
-              const LevelSetOutputRealType & newValue) override;
+  UpdatePixel(const LevelSetInputIndexType & itkNotUsed(index),
+              const LevelSetOutputRealType & itkNotUsed(oldValue),
+              const LevelSetOutputRealType & itkNotUsed(newValue)) override
+  {}
 
 
 protected:
diff --git a/Modules/Segmentation/LevelSetsv4/include/itkLevelSetEquationOverlapPenaltyTerm.hxx b/Modules/Segmentation/LevelSetsv4/include/itkLevelSetEquationOverlapPenaltyTerm.hxx
index fb8c12ceb24..3713143cd60 100644
--- a/Modules/Segmentation/LevelSetsv4/include/itkLevelSetEquationOverlapPenaltyTerm.hxx
+++ b/Modules/Segmentation/LevelSetsv4/include/itkLevelSetEquationOverlapPenaltyTerm.hxx
@@ -32,14 +32,6 @@ LevelSetEquationOverlapPenaltyTerm<TInput, TLevelSetContainer>::LevelSetEquation
   this->m_CacheImage = nullptr;
 }
 
-template <typename TInput, typename TLevelSetContainer>
-void
-LevelSetEquationOverlapPenaltyTerm<TInput, TLevelSetContainer>::UpdatePixel(
-  const LevelSetInputIndexType & itkNotUsed(index),
-  const LevelSetOutputRealType & itkNotUsed(oldValue),
-  const LevelSetOutputRealType & itkNotUsed(newValue))
-{}
-
 template <typename TInput, typename TLevelSetContainer>
 void
 LevelSetEquationOverlapPenaltyTerm<TInput, TLevelSetContainer>::InitializeParameters()
@@ -48,12 +40,6 @@ LevelSetEquationOverlapPenaltyTerm<TInput, TLevelSetContainer>::InitializeParame
 }
 
 
-template <typename TInput, typename TLevelSetContainer>
-void
-LevelSetEquationOverlapPenaltyTerm<TInput, TLevelSetContainer>::Initialize(
-  const LevelSetInputIndexType & itkNotUsed(index))
-{}
-
 template <typename TInput, typename TLevelSetContainer>
 auto
 LevelSetEquationOverlapPenaltyTerm<TInput, TLevelSetContainer>::Value(const LevelSetInputIndexType & index)
diff --git a/Modules/Segmentation/LevelSetsv4/include/itkLevelSetEquationPropagationTerm.h b/Modules/Segmentation/LevelSetsv4/include/itkLevelSetEquationPropagationTerm.h
index 4f754007e0d..f9120f00c40 100644
--- a/Modules/Segmentation/LevelSetsv4/include/itkLevelSetEquationPropagationTerm.h
+++ b/Modules/Segmentation/LevelSetsv4/include/itkLevelSetEquationPropagationTerm.h
@@ -111,13 +111,15 @@ class ITK_TEMPLATE_EXPORT LevelSetEquationPropagationTerm : public LevelSetEquat
 
   /** \todo to be documented. */
   void
-  Initialize(const LevelSetInputIndexType &) override;
+  Initialize(const LevelSetInputIndexType &) override
+  {}
 
   /** Supply updates at pixels to keep the term parameters always updated */
   void
-  UpdatePixel(const LevelSetInputIndexType & iP,
-              const LevelSetOutputRealType & oldValue,
-              const LevelSetOutputRealType & newValue) override;
+  UpdatePixel(const LevelSetInputIndexType & itkNotUsed(iP),
+              const LevelSetOutputRealType & itkNotUsed(oldValue),
+              const LevelSetOutputRealType & itkNotUsed(newValue)) override
+  {}
 
 protected:
   LevelSetEquationPropagationTerm();
diff --git a/Modules/Segmentation/LevelSetsv4/include/itkLevelSetEquationPropagationTerm.hxx b/Modules/Segmentation/LevelSetsv4/include/itkLevelSetEquationPropagationTerm.hxx
index 6741fea81e5..ebc93b77981 100644
--- a/Modules/Segmentation/LevelSetsv4/include/itkLevelSetEquationPropagationTerm.hxx
+++ b/Modules/Segmentation/LevelSetsv4/include/itkLevelSetEquationPropagationTerm.hxx
@@ -48,20 +48,6 @@ LevelSetEquationPropagationTerm<TInput, TLevelSetContainer, TPropagationImage>::
   }
 }
 
-template <typename TInput, typename TLevelSetContainer, typename TPropagationImage>
-void
-LevelSetEquationPropagationTerm<TInput, TLevelSetContainer, TPropagationImage>::Initialize(
-  const LevelSetInputIndexType &)
-{}
-
-template <typename TInput, typename TLevelSetContainer, typename TPropagationImage>
-void
-LevelSetEquationPropagationTerm<TInput, TLevelSetContainer, TPropagationImage>::UpdatePixel(
-  const LevelSetInputIndexType & itkNotUsed(iP),
-  const LevelSetOutputRealType & itkNotUsed(oldValue),
-  const LevelSetOutputRealType & itkNotUsed(newValue))
-{}
-
 template <typename TInput, typename TLevelSetContainer, typename TPropagationImage>
 auto
 LevelSetEquationPropagationTerm<TInput, TLevelSetContainer, TPropagationImage>::PropagationSpeed(
diff --git a/Modules/Segmentation/Watersheds/include/itkWatershedBoundaryResolver.h b/Modules/Segmentation/Watersheds/include/itkWatershedBoundaryResolver.h
index c2368b3b44e..a8106600fa1 100644
--- a/Modules/Segmentation/Watersheds/include/itkWatershedBoundaryResolver.h
+++ b/Modules/Segmentation/Watersheds/include/itkWatershedBoundaryResolver.h
@@ -154,7 +154,8 @@ class ITK_TEMPLATE_EXPORT BoundaryResolver : public ProcessObject
 
   unsigned short m_Face{ 0 };
   void
-  GenerateOutputRequestedRegion(DataObject * output) override;
+  GenerateOutputRequestedRegion(DataObject * itkNotUsed(output)) override
+  {}
 };
 } // end namespace watershed
 } // end namespace itk
diff --git a/Modules/Segmentation/Watersheds/include/itkWatershedBoundaryResolver.hxx b/Modules/Segmentation/Watersheds/include/itkWatershedBoundaryResolver.hxx
index 20451c7b906..356e63a47b1 100644
--- a/Modules/Segmentation/Watersheds/include/itkWatershedBoundaryResolver.hxx
+++ b/Modules/Segmentation/Watersheds/include/itkWatershedBoundaryResolver.hxx
@@ -89,11 +89,6 @@ BoundaryResolver<TPixelType, TDimension>::GenerateData()
 // ------------------------------------------------------------
 // --------------------PIPELINE METHODS------------------------
 // ------------------------------------------------------------
-template <typename TPixelType, unsigned int TDimension>
-void
-BoundaryResolver<TPixelType, TDimension>::GenerateOutputRequestedRegion(DataObject *)
-{}
-
 template <typename TPixelType, unsigned int TDimension>
 typename BoundaryResolver<TPixelType, TDimension>::DataObjectPointer
 BoundaryResolver<TPixelType, TDimension>::MakeOutput(DataObjectPointerArraySizeType)
diff --git a/Modules/Segmentation/Watersheds/include/itkWatershedSegmentTreeGenerator.h b/Modules/Segmentation/Watersheds/include/itkWatershedSegmentTreeGenerator.h
index df30cc4cdd0..5def73e8915 100644
--- a/Modules/Segmentation/Watersheds/include/itkWatershedSegmentTreeGenerator.h
+++ b/Modules/Segmentation/Watersheds/include/itkWatershedSegmentTreeGenerator.h
@@ -219,7 +219,8 @@ class ITK_TEMPLATE_EXPORT SegmentTreeGenerator : public ProcessObject
 
   /** Methods required by the itk pipeline */
   void
-  GenerateOutputRequestedRegion(DataObject * output) override;
+  GenerateOutputRequestedRegion(DataObject * itkNotUsed(output)) override
+  {}
 
   void
   GenerateInputRequestedRegion() override;
diff --git a/Modules/Segmentation/Watersheds/include/itkWatershedSegmentTreeGenerator.hxx b/Modules/Segmentation/Watersheds/include/itkWatershedSegmentTreeGenerator.hxx
index eed1b58600f..6ce89e9ac7f 100644
--- a/Modules/Segmentation/Watersheds/include/itkWatershedSegmentTreeGenerator.hxx
+++ b/Modules/Segmentation/Watersheds/include/itkWatershedSegmentTreeGenerator.hxx
@@ -552,11 +552,6 @@ SegmentTreeGenerator<TScalar>::MergeSegments(SegmentTableTypePointer           s
   eqT->Add(FROM, TO);
 }
 
-template <typename TScalar>
-void
-SegmentTreeGenerator<TScalar>::GenerateOutputRequestedRegion(DataObject * itkNotUsed(output))
-{}
-
 template <typename TScalar>
 void
 SegmentTreeGenerator<TScalar>::GenerateInputRequestedRegion()