Synonyms for capricious

Adjective

1. capricious, freakish, unpredictable (vs. predictable)

usage: changeable; "a capricious summer breeze"; "freakish weather"

2. capricious, impulsive, whimsical, arbitrary (vs. nonarbitrary)

usage: determined by chance or impulse or whim rather than by necessity or reason; "a capricious refusal"; "authoritarian rulers are frequently capricious"; "the victim of whimsical persecutions"