| Solution | Length | |
|---|---|---|
| 3 letters | ||
| set | 3 | |
| 4 letters | ||
| sure | 4 | |
| 5 letters | ||
| stern | 5 | |
| solid | 5 | |
| stiff | 5 | |
| fixed | 5 | |
| rigid | 5 | |
| 6 letters | ||
| smooth | 6 | |
| static | 6 | |
| stable | 6 | |
| steady | 6 | |
| steely | 6 | |
| torpid | 6 | |
| 7 letters | ||
| unmoved | 7 | |
| instone | 7 | |
| regular | 7 | |
| uniform | 7 | |
| 8 letters | ||
| ungiving | 8 | |
| unbroken | 8 | |
| castiron | 8 | |
| resolute | 8 | |
| rigorous | 8 | |
| unfading | 8 | |
| 9 letters | ||
| unaltered | 9 | |
| unbending | 9 | |
| stalemate | 9 | |
| unruffled | 9 | |
| cast-iron | 9 | |
| unchecked | 9 | |
| immutable | 9 | |
| sustained | 9 | |
| steadfast | 9 | |
| UNFAILING | 9 | |
| UNVARYING | 9 | |
| REMAINING | 9 | |
| quiescent | 9 | |
| robotlike | 9 | |
| 10 letters | ||
| SYSTEMATIC | 10 | |
| UNAFFECTED | 10 | |
| stationary | 10 | |
| UNYIELDING | 10 | |
| setinstone | 10 | |
| relentless | 10 | |
| UNCHANGING | 10 | |
| 11 letters | ||
| UNREMITTING | 11 | |
| UNAVOIDABLE | 11 | |
| uncongenial | 11 | |
| undeviating | 11 | |
| unrelenting | 11 | |
| unalterable | 11 | |
| undestroyed | 11 | |
| 12 letters | ||
| unreturnable | 12 | |
| 13 letters | ||
| unsusceptible | 13 | |
| 14 letters | ||
| WRITTENINSTONE | 14 | |
| UNCOMPROMISING | 14 | |
| 16 letters | ||
| undifferentiated | 16 | |