What are the best answers for “the quality of being incapable of mutation”?

fixity, immutability, immutableness.

How many letters does the top answer for “the quality of being incapable of mutation” have?

The most common answer is fixity (6 letters).

3 answers found in Letterora's clue database (Wikidata facts, Open Trivia DB, WordNet and Webster definitions — all licensed sources).

fixity 6 letters wn-def

the quality of being incapable of mutation

immutability 12 letters wn-def

the quality of being incapable of mutation

immutableness 13 letters wn-def

the quality of being incapable of mutation

the quality of being capable of mutation 60% similar → mutability, mutableness