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Adjective: impetuous  im'pe-choo-us
  1. Characterized by undue haste and lack of thought or deliberation
    "an impetuous display of spending and gambling";
    - hotheaded, impulsive, madcap, tearaway, brainish [archaic]
  2. Marked by violent force
    "impetuous heaving waves"

See also: forceful, incautious

Encyclopedia: Impetuous