/ ˈfuːlhɑːdi; NAmE -hɑːrdi/ adjective
( disapproving ) taking unnecessary risks
SYN reckless :
It would be foolhardy to sail in weather like this.
► fool·hardi·ness noun [ U ]
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WORD ORIGIN
Middle English : from Old French folhardi , from fol foolish + hardi bold (past participle of hardir become bold, of Germanic origin).