| Nut |
| Kook |
| Wacko |
| Maniac |
| Madman |
| Nutcase |
| Wack job |
| Crackpot |
| Fruitcake |
| Crazy person |
| Demented one |
| Really absurd |
| Certain fringe |
| Asylum resident |
| Total screwball |
| Moon-dog problem? |
| Wild and crazy guy |
| Recklessly foolish |
| ___ fringe (extremists) |
| __ fringe: fanatical extremists |