| Flaky |
| Flighty |
| Clueless |
| Airheaded |
| Addlebrained |
| Bubbleheaded |
| Lightheaded? |
| Rattlebrained |
| In la-la land |
| Bubble-headed |
| Easily addled |
| Featherbrained |
| Scatterbrained |
| A little loopy |
| Like a dingbat |
| Easily confused |
| Like an airhead |
| Eccentric (var.) |
| Not very logical |
| Airheaded (var.) |
| Flibbertigibbety |
| Like a space cadet |
| Like a rattlebrain |
| Eccentric to be kind |
| Eccentrically foolish |
| Not at all analytical |
| Scatterbrained (var.) |
| Like a flibbertigibbet |
| Like an airhead (var.) |
| Easily confused (Var.) |
| A few fries short of a Happy Meal |