Definition of impulsive :
1. Acting momentarily, or by impulse; not continuous; - said of forces.
2. Actuated by impulse or by transient feelings.
3. Having the power of driving or impelling; giving an impulse; moving; impellent.
4. That which impels or gives an impulse; an impelling agent.
brainish, unprompted, voluntary, planned, sudden, madcap, free, harum-scarum, unbidden, spur-of-the-moment, automatic, dynamical, instinctive, involuntary, reflex, precipitate, driving, offhand, tearaway, improvident, dynamic, precipitant, self-generated, freakish, unpredictable, willing, slapdash, temerarious, headlong, careful, unconsidered
irresolute (part of speech: adjective)
insipid, undecided, shrinking, changeable, inconsistent, spineless, fly-by-night, shifty, infirm, shy, unresolved, irresponsible, unwilling, undependable, double-minded, tentative, irresolute, uncertain, dillydallying, weak, watery, unsure, yellow, shilly-shally, halfhearted, erratic, hesitant, vacillating
fickle (part of speech: adjective)
motiveless (part of speech: adjective)
capricious, careless, reasonless, fleeting, fickle, flitting, ambivalent, indecisive, irregular, systemless, whimsical, motiveless, fanciful, sporadic, nonsystematic, flighty, wandering, chancy, rambling, spastic, unmethodical, volatile, wayward, random, adrift, haphazard, arbitrary
rash (part of speech: adjective)
excitable (part of speech: adjective)
explosive, reckless, nervous, fragile, ardent, passionate, hot-tempered, fiery, edgy, crusty, tempestuous, short-tempered, quick-tempered, volcanic, combustible, emotional, high-strung, excitable, sensitive, touchy, stormy, cranky, brittle, irritable
impulsive (part of speech: adjective)
capricious (part of speech: adjective)
- If Jerry, through her mother's nature, was impulsive and imaginative, from her father she had inherited balance and clear vision. - "The Reclaimers", Margaret Hill McCarter.
- Because she had, in her gracious ignorance, given me a young girl's impulsive friendship, was I to mistake her? - "The Maids of Paradise", Robert W. (Robert William) Chambers.
- But she has one fault- she is too impulsive. - "The New Magdalen", Wilkie Collins.