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impulsive (adj.)

early 15c., originally in reference to medicine that reduces swelling or humors, from Medieval Latin impulsivus, from Latin impuls-, past participle stem of impellere "strike against, push against" (see impel). Meaning "having the property of impelling" (of force, cause, energy, etc.) is from c. 1600. Of persons, "rash, characterized by impulses," from 1847, from impulse. Earlier, at least once, in reference to maniacs:

The impulsive insane are often irritable, restless and jealous. Sometimes they have delusions, and sometimes not. Their delusions frequently seem to have no connection with their outbreaks of violence. They are often the best and at the same time the most dangerous class of patients in the asylums. They have little of the charity of the world, are most likely to be punished for their offences, and yet have the least control over their conduct. ["Impulsive and Homicidal Insanity," Boston Medical and Surgical Journal," April 19, 1843]

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Definitions of impulsive from WordNet

impulsive (adj.)
characterized by undue haste and lack of thought or deliberation; (`brainish' is archaic);
liable to such impulsive acts as hugging strangers
Synonyms: hotheaded / impetuous / madcap / tearaway / brainish
impulsive (adj.)
proceeding from natural feeling or impulse without external stimulus;
an impulsive gesture of affection
Synonyms: unprompted
impulsive (adj.)
without forethought;
letting him borrow her car was an impulsive act that she immediately regretted
impulsive (adj.)
having the power of driving or impelling;
an impulsive force
Synonyms: driving
impulsive (adj.)
determined by chance or impulse or whim rather than by necessity or reason;
Synonyms: capricious / whimsical
From wordnet.princeton.edu