| Kook |
| Zany |
| Bats |
| Daft |
| Nuts |
| Gaga |
| Wacko |
| Crazy |
| Cuckoo |
| Bananas |
| Bonkers |
| Meshuga |
| Foolish |
| Tetched |
| Crackers |
| Senseless? |
| Cockamamie |
| Harebrained |
| Nonsensical |
| Certifiable |
| Kind of bin |
| Type of bin |
| Out to lunch |
| Off the wall |
| Very foolish |
| Not all there |
| Canadian clam |
| Round the bend? |
| Bananas or nuts |
| Mad as a hatter |
| Off one's rocker |
| Soft in the head |
| Non compos mentis |
| Extremely foolish |
| ____ tunes (crazy) |
| Senselessly foolish |
| One brick shy of a load |
| Certifiable, so to speak |
| More than a little silly |
| Crackers, nuts or bananas |
| Bananas, crackers or nuts |
| A few bricks shy of a load |
| More than a little foolish |
| Considerably less than all there |