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