Synonyms: impetuous, impulsive, hotheaded, brainish, tearaway, madcap
Definition: characterized by undue haste and lack of thought or deliberation
Usage: 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
Definition: determined by chance or impulse or whim rather than by necessity or reason
Usage: a capricious refusal; authoritarian rulers are frequently capricious; the victim of whimsical persecutions
Similar words: arbitrary
Definition: based on or subject to individual discretion or preference or sometimes impulse or caprice
Usage: an arbitrary decision; the arbitrary rule of a dictator; an arbitrary penalty; of arbitrary size and shape; an arbitrary choice; arbitrary division of the group into halves
Definition: having the power of driving or impelling
Usage: a driving personal ambition; the driving force was his innate enthusiasm; an impulsive force
Similar words: dynamic, dynamical
Definition: characterized by action or forcefulness or force of personality
Usage: a dynamic market; a dynamic speaker; the dynamic president of the firm
Synonyms: impulsive
Definition: without forethought
Usage: letting him borrow her car was an impulsive act that she immediately regretted
Similar words: unpremeditated
Definition: not premeditated
Synonyms: unprompted, impulsive
Definition: proceeding from natural feeling or impulse without external stimulus
Usage: an impulsive gesture of affection
Similar words: spontaneous, self-generated
Definition: happening or arising without apparent external cause
Usage: spontaneous laughter; spontaneous combustion; a spontaneous abortion