DUD

n. & adj. sl.

n. 1 a futile or ineffectual person or thing (a dud at the job). 2 a counterfeit article. 3 a shell etc. that fails to explode. 4 (in pl.) clothes.

adj. 1 useless, worthless, unsatisfactory or futile. 2 counterfeit.

[ ME: orig. unkn. ]