Synonyms of impulsive

1 Syllable

mad, quick, rash, yoyo, swift

2 Syllables

headstrong, upfront, headlong, moody, flighty, hasty, daring, fiery, lamber, hastier, up-front, flightier, naive, fitful, dingdong, hastiest, violent, moodier, flaky, sudden, will-less, rampant, abrupt, casual, re-flex, yo-yo, whirlwind, flightiest, offhand, ad-lib

3 Syllables

spontaneous, mercurial, incautious, unthinking, impetuous, unwilled, unruly, hotblooded, inconstant, capricious, unjaded, cyclonic, subito, unalert, unguarded, hot-and-cold, unprompted, up-and-down, vagarious, surprising, splenetic, volcanic, instinctual, quixotic, changeful, quicksilver, careless, changeable

4 Syllables

unscientific, unrehearsed, undesigning, injudicious, quick-tempered, automatic, excitable, devil-may-care, precipitant, highpowered, high-pressure, unassumed, unlabored, passionate, fanatical, unvigilant, humorsome, reversible, unlooked-for, unpredicted, instinctive, indocile, unexpected, intuitional, emotional, permutable, revocable, momentary, reflexive, bubbleheaded, intuitive, uncircumspect

5 Syllables

extemporaneous, unpredictable, ill-considered, precipitate, unconsidered, autogenetic, unembarrassed, unmeditated, uncalculated, involuntary, second-nature, commutative

6 Syllables

unpremeditated