See reckless in American Heritage Dictionary 4 Synonyms
reckless rash 1precipitate foolhardy temerarious
These adjectives mean given to or marked by unthinking boldness. Reckless suggests wild carelessness and disregard for consequences: “conceiving measures to protect the fur-bearing animals from reckless slaughter” (Getrude Atherton).
Rash implies haste, impetuousness, and insufficient consideration: “Take calculated risks. That is quite different from being rash” (George S. Patton).
Precipitate connotes headlong haste without due deliberation: “destroyed in a precipitate burning of his papers a few days before his death” (James Boswell).
Foolhardy implies injudicious or imprudent boldness: a foolhardy attempt to wrest the gun from the mugger.
Temerarious suggests reckless presumption: “this temerarious foeman who dared intervene between himself [the elephant] and his intended victim” (Edgar Rice Burroughs).
See reckless in Webster's New World Roget's A-Z Thesaurus II
adjective
Lacking or marked by a lack of care:
careless, feckless, heedless, inattentive, irresponsible, thoughtless, unconcerned, unmindful, unthinking. See carefulCharacterized by unthinking boldness and haste:
brash, foolhardy, harum-scarum, hasty, headlong, hotheaded, ill-considered, impetuous, improvident, impulsive, incautious, madcap, precipitant, precipitate, rash1, slapdash, temerarious, unconsidered. See careful
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