| foul-up(fool, incompetent, butcher, bungler, bumbler) |
| fumbler(fool, incompetent, butcher, bungler, bumbler) |
| goof off(expression, fool, incompetent, butcher, bungler) |
| goofball(fool, incompetent, butcher, bungler, bumbler) |
| harebrain(fool, incompetent, butcher, bungler, bumbler) |
| hasher |
| idiot(fool, incompetent, butcher) |
| ignoramus(fool, incompetent, butcher) |
| incompetent(fool, butcher, bungler, bumbler, fumbler) |
| jumbler |
| klutz(fool, incompetent, butcher) |
| mismanager(fool, incompetent, butcher, bungler, bumbler) |
| muffer(fool, incompetent, butcher, bungler, bumbler) |
| numskull(fool, incompetent, butcher) |
| obfuscator |
| puzzler |
| screw up(expression, fool, incompetent, butcher) |
| spoiler(fool, incompetent, butcher, bungler, bumbler) |
| born loser(expression, bungler, bumbler, fumbler) |
| defaulter(bungler, bumbler, fumbler) |