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

The most common answer is tractability (12 letters).

Crossword clue: the trait of being easily persuaded

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

tractability 12 letters wn-def

the trait of being easily persuaded

tractableness 13 letters wn-def

the trait of being easily persuaded

capable of being persuaded; easily persuaded. 60% similar → suasible