dud

中文： 瞎炮、哑炮、哑弹、瞎弹

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. (informal)
2. A failure of any kind. (informal)
3. A loser; an unlucky person. (informal) · I got stuck with a seatmate who was a conversational dud.
4. A lottery ticket that does not give a payout. (informal)

复数 duds