Longman Dictionary of Contemporary English homepage

Date: 1300-1400
Language: French
Origin: impétueux, from Late Latin impetuosus, from Latin impetus; IMPETUS

impetuous

 adjective
     
im‧pet‧u‧ous
tending to do things very quickly, without thinking carefully first, or showing this quality [= impulsive]:
He was high-spirited and impetuous.
She might live to regret this impetuous decision.
—impetuously adverb
—impetuousness noun [uncountable]
—impetuosity noun [uncountable]
Definition from the Longman Dictionary of Contemporary English
Advanced Learner's Dictionary.
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