How many letters does the top answer for “the trait of being cooperative” have?

The most common answer is amenability (11 letters).

Crossword clue: the trait of being cooperative

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

amenability 11 letters wn-def

the trait of being cooperative

cooperativeness 15 letters wn-def

the trait of being cooperative

the trait of being adventurous 50% similar → adventurousness, venturesomeness

the trait of being afraid 50% similar → fearfulness

the trait of being communicative 50% similar → communicativeness

the trait of being injudicious 50% similar → injudiciousness

the trait of being resolute 50% similar → firmness, resoluteness, resolve

the trait of being unmanageable 50% similar → recalcitrance, recalcitrancy, refractoriness

the trait of being unwilling 50% similar → involuntariness, unwillingness