| crazy(noun, fanatic, loony, dingbat, ultraist) |
| nut(noun, crazy, fanatic, loony, lamebrain) |
| bungler(noun, bumbler, fumbler) |
| crackpot(noun, crazy, loony) |
| ding-a-ling(noun, fanatic, lamebrain, schizoid, dingbat) |
| kook(noun, fanatic, dingbat, ultraist) |
| screwball(noun, fool, crazy, loony, dummy) |
| blockhead(noun, fool, incompetent, butcher, dummy) |
| crank(noun, crazy, loony) |
| featherbrain(noun, fool, incompetent, butcher, bungler) |
| lunatic(noun, crazy, loony) |
| addlebrain(noun, fool, incompetent, butcher, bungler) |
| bedlamite(noun, crazy, nut, fanatic, loony) |
| birdbrain |
| blunderer(noun, fool, incompetent, butcher, bungler) |
| bonehead(noun, fool, incompetent, butcher) |
| botcher(noun, fool, incompetent, butcher) |
| brainless |
| bumbler(noun, fool, incompetent, butcher, bungler) |
| bust |