DUD

[noun] [C], [adjective] [not gradable] - (something) of no value or that does not workNot one of the books she has written has been a dud.Of the many bombs that were found, several turned out to be duds.There is a growing trade overseas in dud medicines.One of the customers tried to pass off a dud cheque (= one for which a bank will not give money) today.