How many letters does the top answer for “determined by chance or impulse or whim rather than by necessity or reason” have?

The most common answer is capricious (10 letters).

Crossword clue: determined by chance or impulse or whim rather than by necessity or reason

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

capricious 10 letters wn-def

determined by chance or impulse or whim rather than by necessity or reason

whimsical 9 letters wn-def

determined by chance or impulse or whim rather than by necessity or reason