| Solution | Length | |
|---|---|---|
| 3 letters | ||
| dim | 3 | |
| 4 letters | ||
| dodo | 4 | |
| dull | 4 | |
| slow | 4 | |
| 5 letters | ||
| acute | 5 | |
| angle | 5 | |
| crass | 5 | |
| DENSE | 5 | |
| thick | 5 | |
| 6 letters | ||
| cretin | 6 | |
| stupid | 6 | |
| wooden | 6 | |
| stolid | 6 | |
| unfelt | 6 | |
| simple | 6 | |
| 7 letters | ||
| DOLTISH | 7 | |
| rounded | 7 | |
| 8 letters | ||
| sluggish | 8 | |
| SOULLESS | 8 | |
| UNLOVING | 8 | |
| 9 letters | ||
| unpointed | 9 | |
| unfeeling | 9 | |
| 10 letters | ||
| spiritless | 10 | |
| 11 letters | ||
| THICKHEADED | 11 | |
| unsharpened | 11 | |
| UNTOUCHABLE | 11 | |
| slow-witted | 11 | |
| unemotional | 11 | |
| 12 letters | ||
| thick-witted | 12 | |
| unperceptive | 12 | |
| unresponsive | 12 | |
| 13 letters | ||
| unsympathetic | 13 | |
| unsusceptible | 13 | |
| unintelligent | 13 | |
| unimpassioned | 13 | |
| Thick-skinned | 13 | |
| 14 letters | ||
| unaffectionate | 14 | |