Synonyms:
hotheaded, impulsive, impetuous, madcap, tearaway(a), brainish
Meaning: characterized by undue haste and lack of thought or deliberation; "a hotheaded decision"; "liable to such impulsive acts as hugging strangers"; "an impetuous display of spending and gambling"; "madcap escapades"; (`brainish' is archaic)
Synonyms:
capricious, impulsive, whimsical
Meaning: 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"
Synonyms:
driving, impulsive
Meaning: having the power of driving or impelling; "a driving personal ambition"; "the driving force was his innate enthusiasm"; "an impulsive force"
Synonyms:
impulsive
Meaning: without forethought; "letting him borrow her car was an impulsive act that she immediately regretted"
Synonyms:
impulsive, unprompted
Meaning: proceeding from natural feeling or impulse without external stimulus; "an impulsive gesture of affection"
Usage examples
She's quick and impulsive, but she--she couldn't act.
She Was impulsive and impatient, he deliberate and grave.
My own mistake arose, naturally enough, through too careless, too inquisitive, and too impulsive a temperament.
In her joy Anne forgot the precarious nature of her footing, incautiously ceased to lean on the window sill, gave an impulsive little hop of pleasure . . . and the next moment she had crashed through the roof up to her armpits, and there she hung, quite unable to extricate herself. Diana dashed into the duck house and, seizing her unfortunate friend by the waist, tried to draw her down.