immutability immusically • immutable · · · Info · Definitions · Synonyms · Antonyms · Characters · · immutability · · Text Latin · · Script 12 · · Length Definitions · · · (noun) the quality of being incapable of mutation. Synonyms: immutableness, fixity. Example: "Darwin challenged the fixity of species." · · Noun Definition 1 Synonyms · · · immutableness · · Synonym 1 fixity · · Synonym 2 Antonyms · · · mutability · · Antonym 0 mutableness · · Antonym 1 Characters · · a latin small letter a U+0061 b latin small letter b U+0062 i latin small letter i U+0069 l latin small letter l U+006C m latin small letter m U+006D t latin small letter t U+0074 u latin small letter u U+0075 y latin small letter y U+0079