#immutability__immutableness__immutablenes  the quality of being incapable of mutation
  exclusion:  #mutability
  supertype:  #unchangeability__changelessness__unchangeableness__unchangingness  the quality of being unchangeable; having a marked tendency to remain unchanged
  subtype:  #unalterability  the quality of not being alterable
     subtype:  #incurability  incapability of being altered in disposition or habits: "the incurability of his optimism"
  subtype:  #agelessness__agelessnes  the quality of being timeless and eternal

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