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impetuous (adj.)

late 14c., "hot-tempered, fierce;" late 15c., "done or given with a rush of force," from Old French impetuos (13c., Modern French impétueux) and directly from Late Latin impetuosus "impetuous, violent" (source also of Spanish and Italian impetuoso), from Latin impetus "attack" (see impetus). Related: Impetuously; impetuousness.

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Definitions of impetuous from WordNet

impetuous (adj.)
characterized by undue haste and lack of thought or deliberation; (`brainish' is archaic);
an impetuous display of spending and gambling
Synonyms: hotheaded / impulsive / madcap / tearaway / brainish
impetuous (adj.)
marked by violent force;
impetuous heaving waves
From wordnet.princeton.edu