daft UK /dɑːft/US /dæft/ adjective3 •(UK, informal) Foolish, silly, stupid.Thou art the daftest fuill that ever I saw. / Trows thou, man, be the law to get remeid / Of men of kirk? Na, nocht till thou be deid. — 1602 •(UK, informal) Crazy, insane, mad. •(no longer used) Gentle, meek, mild. formsdafter · daftest