Entry 2 senses · 2 variants Webster, 1913 goof · IPA /ɡuːf/ n. v. i. 01 n. a stupid fool. 1. a stupid fool.[Colloq.] Syn. fathead, jackass, goose, cuckoo, zany. 02 v. i. to commit a faux pas or fault. 1. to commit a faux pas or fault. Syn. sin, commit an offence, blunder, boob.