dud

Short definition from Wiktionary

Noun

1. 1
   A device or machine that is useless because it does not work properly or has failed to work, such as a bomb, or explosive projectile.
2. 2
   A failure of any kind.
3. 3
   A failure of any kind: A loser; an unlucky person.
4. 4
   A failure of any kind: A lottery ticket that does not give a payout.
5. 5
   Clothes, now always used in plural form duds.

Adjective

1. 1
   Useless; failing; ineffective.