impulsive

Adjective
  1. Proceeding from natural feeling or impulse without external stimulus (synset 302290385)
    "an impulsive gesture of affection"
    similar to: self-generated, spontaneous - happening or arising without apparent external cause
    same as: unprompted
  2. Without forethought (synset 301849129)
    "letting him borrow her car was an impulsive act that she immediately regretted"
    similar to: unpremeditated - not premeditated
  3. Having the power of driving or impelling (synset 300812509)
    "a driving personal ambition"; "the driving force was his innate enthusiasm"; "an impulsive force"
    similar to: dynamic, dynamical - characterized by action or forcefulness or force of personality
    same as: driving
  4. Determined by chance or impulse or whim rather than by necessity or reason (synset 300722886)
    "a capricious refusal"; "authoritarian rulers are frequently capricious"; "the victim of whimsical persecutions"
    similar to: arbitrary - based on or subject to individual discretion or preference or sometimes impulse or caprice
    same as: capricious, whimsical
  5. Characterized by undue haste and lack of thought or deliberation (synset 300327506)
    "a hotheaded decision"; "liable to such impulsive acts as hugging strangers"; "an impetuous display of spending and gambling"; "madcap escapades"
    domain usage: archaicism, archaism - the use of an archaic expression
    similar to: incautious - lacking in caution
    same as: brainish, hotheaded, impetuous, madcap, tearaway

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