| Noun | 1. | dud - someone who is unsuccessfulcolloquialism - a colloquial expression; characteristic of spoken or written communication that seeks to imitate informal speech | |
| 2. | dud - an explosion that fails to occur | |
| 3. | dud - an event that fails badly or is totally ineffectual; "the first experiment was a real turkey"; "the meeting was a dud as far as new business was concerned"bust, flop - a complete failure; "the play was a dismal flop" | |
| Adj. | 1. | dud - failing to detonate; especially not charged with an active explosive; "he stepped on a dud mine"unloaded - (of weapons) not charged with ammunition; "many people are killed by guns thought to be unloaded" | |