Adjective
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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)
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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"
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having the power of driving or impelling
"a driving personal ambition"
"the driving force was his innate enthusiasm"
"an impulsive force"
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without forethought
"letting him borrow her car was an impulsive act that she immediately regretted"
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proceeding from natural feeling or impulse without external stimulus
"an impulsive gesture of affection"