dud

from The American Heritage® Dictionary of the English Language, 5th Edition.

• noun A bomb, shell, or explosive round that fails to detonate.
• noun Informal One that is disappointingly ineffective or unsuccessful.
• noun Clothing.
• noun Personal belongings.

from The Century Dictionary.

• noun A coarse cloak or mantle.
• noun A rag.
• noun plural [Formerly also spelled dudes, as in Harman's “Caveat” (1567), where the word is erroneously set down as “pedlar's French”—that is, thieves' cant.] Clothes; especially, poor or ragged clothing; tatters: used in contempt.

from Wiktionary, Creative Commons Attribution/Share-Alike License.

• noun informal 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.
• noun A lottery ticket that does not give a payout.
• noun obsolete Clothes, now always used in plural form duds.

from WordNet 3.0 Copyright 2006 by Princeton University. All rights reserved.

• adjective failing to detonate; especially not charged with an active explosive
• noun someone who is unsuccessful
• noun an event that fails badly or is totally ineffectual
• noun an explosion that fails to occur