impulsive

If someone is impulsive, it means that they act on instinct, without thinking decisions through. If you worked for an entire year to save money for a car and then suddenly decided to spend it all on an outfit instead, that would be an impulsive purchase.

Impulses are short, quick feelings, and if someone is in the habit of acting on them, they're impulsive. When stores stock chocolate at the checkout line, they are hoping you will impulsively decide to buy it. When you call the person you have a crush on after promising yourself all day to maintain an air of dignified reserve, that's impulsive behavior. We might also call impulsive behavior whimsical or capricious.

PRIMARY MEANINGS OF: impulsive

1
adj
without forethought
2
adj
having the power of driving or impelling
FULL DEFINITIONS OF: impulsive
1

adj without forethought

“letting him borrow her car was an impulsive act that she immediately regretted”
Synonyms
unpremeditated
not premeditated

adj characterized by undue haste and lack of thought or deliberation

“liable to such impulsive acts as hugging strangers”
Synonyms:
brainish, hotheaded, impetuous, madcap, tearaway
incautious
lacking in caution

adj determined by chance or impulse or whim rather than by necessity or reason

Synonyms:
capricious, whimsical
arbitrary
based on or subject to individual discretion or preference or sometimes impulse or caprice

adj proceeding from natural feeling or impulse without external stimulus

“an impulsive gesture of affection”
Synonyms:
unprompted
self-generated, spontaneous
happening or arising without apparent external cause
2

adj having the power of driving or impelling

“an impulsive force”
Synonyms:
driving
dynamic, dynamical
characterized by action or forcefulness or force of personality
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