Meaning

adjective marked by defiant disregard for danger or consequences; ; -Macaulay

originFrom Middle English folehardy, foolhardi, folherdi, from Old French fol hardi (“foolishly bold”), from Old French fol (“foolish, silly; insane, mad”) (from Latin follis (“bellows; purse, sack; inflated ball; belly, paunch”), ultimately from Proto-Indo-European *bʰelǵʰ- (“to swell”)) + Old French hardi (“durable, hardy, tough”) (past tense of hardir (“to harden”), from the unattested Frankish…

Etymology from Wiktionary, CC BY-SA 3.0