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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.

Synonyms:

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

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

mutable, inconstant, pliable, permutable, plastic, pliant, malleable, modifiable, unreliable

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

brash, incautious, daring, injudicious, unheedful, audacious, brazen, hotheaded, imprudent, thoughtless, hectic, desperado, impetuous, breakneck, daredevil, foolhardy

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

impromptu, unpremeditated, abrupt, improvised, instantaneous, hasty, unrehearsed, ill-considered, spontaneous, rash, reflexive, extemporaneous

fluctuating, fitful, scatterbrained, frivolous

Usage examples:

• 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.