How many letters does the top answer for “the quality of being unchangeable; having a marked tendency to remain unchanged” have?

The most common answer is changelessness (14 letters).

Crossword clue: the quality of being unchangeable; having a marked tendency to remain unchanged

changelessness, unchangeability, unchangeableness, unchangingness.

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

changelessness 14 letters wn-def

the quality of being unchangeable; having a marked tendency to remain unchanged

unchangeability 15 letters wn-def

the quality of being unchangeable; having a marked tendency to remain unchanged

unchangeableness 16 letters wn-def

the quality of being unchangeable; having a marked tendency to remain unchanged

unchangingness 14 letters wn-def

the quality of being unchangeable; having a marked tendency to remain unchanged

the quality of being changeable; having a marked tendency to change 50% similar → changeability, changeableness