| fault |
| faux pas(noun, expression, bomb, disappointment, catastrophe) |
| featherbrain(bungler, bumbler, fumbler) |
| fiasco(noun, bomb, disappointment, catastrophe, letdown) |
| flash in the pan(noun, expression, idiom, bomb, disappointment) |
| foul-up(bungler, bumbler, fumbler) |
| foulup(bungler, bumbler, fumbler) |
| frustration(noun, bomb, disappointment, catastrophe, letdown) |
| fumbler(bungler, bumbler) |
| goofball(bungler, bumbler, fumbler) |
| harebrain(bungler, bumbler, fumbler) |
| implosion(noun, bomb, disappointment, catastrophe, letdown) |
| inadequacy(noun, bomb, disappointment, catastrophe, letdown) |
| lame-duck |
| lapse |
| lead balloon(noun, expression, bomb, disappointment, catastrophe) |
| lemon(noun, bomb, disappointment, catastrophe, letdown) |
| letdown(noun, bomb, disappointment, catastrophe, fiasco) |
| mess(noun, bomb, disappointment, catastrophe, letdown) |
| misadventure(noun, bomb, disappointment, catastrophe, letdown) |