proceeding from natural feeling or impulse without external stimulus; an impulsive gesture of affection

[ Syn: unprompted ]

without forethought; letting him borrow her car was an impulsive act that she immediately regretted'

having the power of driving or impelling; a driving personal ambition; the driving force was his innate enthusiasm; an impulsive force

[ Syn: driving ]

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

[ Syn: capricious , whimsical ]

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)

[ Syn: hotheaded , impetuous , madcap , tearaway , brainish ]