definition of
impulsive

[1] #1 impulsive s. [unprompted] proceeding from natural feeling or impulse without external stimulus; "an impulsive gesture of affection". wn

[2] #2 impulsive s. [driving] having the power of driving or impelling; "a driving personal ambition"; "the driving force was his innate enthusiasm"; "an impulsive force". wn

[3] #3 impulsive s. [capricious, whimsical] 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". wn

[4] #4 impulsive s. [hotheaded, impetuous, madcap, tearaway, brainish] 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). wn