dud

Universal Words noun, adjective noun 1 [C] (informal) a thing that is useless, especially because it does not work correctly: Two of the fireworks in the box were duds. 2 (duds) [pl.] (slang) clothes adjective [onlybeforenoun] useless; that does not work correctly: a dud battery * a dud cheque (= written by sb who has not enough money in their bank account)