Definition of fool adjective from the Oxford Advanced Learner's Dictionary

 

fool

 adjective
adjective
BrE BrE//fuːl//
 
; NAmE NAmE//fuːl//
 
 
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[only before noun] (informal) showing a lack of intelligence or good judgement synonym silly, stupid, foolish That was a damn fool thing to do! That fool husband of mine locked us out of the house. Word Originadjective Middle English: from Old French fol ‘fool, foolish’, from Latin follis ‘bellows, windbag’, by extension ‘empty-headed person’.
See the Oxford Advanced American Dictionary entry: fool