Etymology
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foolhardy (adj.)

also fool-hardy, mid-13c., folhardi, from fol "fool" (see fool (n.1) + hardi "bold" (see hardy) hence "foolishly brave, bold without judgment or moderation." Compare Old French fol hardi. Related: foolhardiness (mid-13c.); Middle English had also as a noun foolhardiment (mid-15c.).

updated on March 30, 2022

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Definitions of foolhardy from WordNet

foolhardy (adj.)
marked by defiant disregard for danger or consequences; "became the fiercest and most reckless of partisans"-Macaulay;
foolhardy enough to try to seize the gun from the hijacker
Synonyms: heady / rash / reckless
Etymologies are not definitions. From wordnet.princeton.edu, not affiliated with etymonline.