| mercurial(adjective, careless, lively, unstable, unreasonable) |
| moody(careless, unstable, unreasonable, unpredictable, changeable) |
| moronic(adjective, silly, stupid, insignificant, unreasonable) |
| notional(adjective, happy, perfect, careless, unstable) |
| nutty as fruitcake(expression, idiom, silly, foolish, mad) |
| oddball(unusual, wild, strange, crazy, irregular) |
| of unsound mind(expression, idiom, silly, foolish, mad) |
| offbeat(adjective, happy, perfect, unusual, strange) |
| out to lunch(expression, adjective, idiom, silly, crazy) |
| preposterous(adjective, great, wrong, happy, perfect) |
| quirky(unusual, careless, wild, unstable, unreasonable) |
| ridiculous(adjective, light, wrong, wild, silly) |
| screw loose(expression, silly, foolish, mad, insane) |
| sentimental |
| singular(extraordinary, unusual, wild, strange, crazy) |
| stupid(adjective, wrong, wild, silly, foolish) |
| temperamental(careless, lively, unstable, unreasonable, unpredictable) |
| tender |
| thoughtless(impetuous, unwary) |
| unnatural(extraordinary, unusual, wild, strange, crazy) |