| Solution | Length | |
|---|---|---|
| 3 letters | ||
| set | 3 | |
| 4 letters | ||
| wont | 4 | |
| 5 letters | ||
| caked | 5 | |
| stale | 5 | |
| tough | 5 | |
| stiff | 5 | |
| stony | 5 | |
| dried | 5 | |
| 6 letters | ||
| seared | 6 | |
| inured | 6 | |
| enured | 6 | |
| wonted | 6 | |
| steely | 6 | |
| run-in | 6 | |
| 7 letters | ||
| callous | 7 | |
| steeled | 7 | |
| used to | 7 | |
| settled | 7 | |
| trained | 7 | |
| 8 letters | ||
| tempered | 8 | |
| stubborn | 8 | |
| seasoned | 8 | |
| obdurate | 8 | |
| INDURATE | 8 | |
| INEDURED | 8 | |
| 9 letters | ||
| reprobate | 9 | |
| unfeeling | 9 | |
| unnatural | 9 | |
| VITRIFIED | 9 | |
| obstinate | 9 | |
| shameless | 9 | |
| untouched | 9 | |
| STIFFENED | 9 | |
| toughened | 9 | |
| 10 letters | ||
| unsoftened | 10 | |
| unmerciful | 10 | |
| UNYIELDING | 10 | |
| SOLIDIFIED | 10 | |
| reinforced | 10 | |
| INSENSIBLE | 10 | |
| IMPENITENT | 10 | |
| 11 letters | ||
| unrepentant | 11 | |
| 12 letters | ||
| strengthened | 12 | |
| unresponsive | 12 | |
| 13 letters | ||
| Thick-skinned | 13 | |