| Jerk |
| Dolt |
| Dope |
| Fool |
| Loon |
| Dodo |
| Boob |
| Bozo |
| Idiot |
| Dummy |
| Dunce |
| Airhead |
| Pinhead |
| Dipstick |
| Numskull |
| Bonehead |
| Dumbbell |
| Peabrain |
| Blockhead |
| Simpleton |
| Numbskull |
| Lamebrain |
| Birdbrain |
| Harebrain |
| Dunderhead |
| Chowderhead |
| Knucklehead |
| Foolish one |
| No Einstein |
| Scatterbrain |
| Featherbrain |
| Foolish person |
| No Einstein he |
| Dim bulb, so to speak |
| Foolish or dull person |
| Rhyming term for a birdbrain |
| Rhyming word meaning "airhead |
| One not mistaken for an Einstein |