| dippy(adjective, silly, foolish, mad, insane) |
| erratic(adjective, silly, foolish, mad, insane) |
| fruit cake(expression, crazy, mad, insane) |
| gaga |
| idiotic(adjective, silly, foolish, mad, insane) |
| loose in the bean(expression, crazy, mad, insane) |
| loose in the upper storey(expression, crazy, mad, insane) |
| lost one's mind(expression, crazy, mad, insane) |
| lost your marbles(expression, crazy, mad, insane) |
| lost your mind(expression, crazy, mad, insane) |
| lunatic(adjective, silly, foolish, mad, insane) |
| mad as a cut snake(expression, crazy, mad, insane) |
| mad as a meat axe(expression, crazy, mad, insane) |
| maniacal(adjective, silly, foolish, mad, insane) |
| mental(adjective, silly, foolish, mad, insane) |
| moonstruck(adjective, silly, foolish, mad, insane) |
| not right in the head(expression, crazy, mad, insane) |
| nothing upstairs(expression, crazy, mad, insane) |
| nutty as a fruitcake(expression, crazy, mad, insane) |
| off one's block(expression, crazy, mad, insane) |