Merriam-Webster Collegiate® Dictionary

¹dudPronunciation:    ‘dədFunction:          nounEtymology:         Middle English duddeDate:              1567

1 plural a : CLOTHING b : personal belongings
2 a : one that is ineffectual also : FAILURE <a box-office dud> b : MISFIT
3 : a bomb or missile that fails to explode

²dudFunction:          adjectiveDate:              1903

: of little or no worth : VALUELESS <dud checks>…

Concise Oxford English Dictionary

informal■noun

    a thing that fails to work properly. ▶

an ineffectual person.
    (duds) clothes.
■adjective

 failing to work or meet a standard.

ME: of unknown origin….

EngMac

dud

неуспех…

English-Serbian dictionary

Dud

Neuspeh