| Solution | Length | |
|---|---|---|
| 4 letters | ||
| firm | 4 | |
| sure | 4 | |
| same | 4 | |
| 5 letters | ||
| rigid | 5 | |
| solid | 5 | |
| 6 letters | ||
| torpid | 6 | |
| sacred | 6 | |
| static | 6 | |
| steady | 6 | |
| stable | 6 | |
| 7 letters | ||
| radiant | 7 | |
| regular | 7 | |
| settled | 7 | |
| supreme | 7 | |
| tedious | 7 | |
| uniform | 7 | |
| 8 letters | ||
| timeless | 8 | |
| reliable | 8 | |
| resolute | 8 | |
| unfading | 8 | |
| 9 letters | ||
| IMMOVABLE | 9 | |
| UNVARYING | 9 | |
| immutable | 9 | |
| unlimited | 9 | |
| unaltered | 9 | |
| UNFAILING | 9 | |
| unbounded | 9 | |
| sovereign | 9 | |
| sustained | 9 | |
| quiescent | 9 | |
| UNDEFINED | 9 | |
| steadfast | 9 | |
| REMAINING | 9 | |
| unchecked | 9 | |
| 10 letters | ||
| INVARIABLE | 10 | |
| UNCHANGING | 10 | |
| stationary | 10 | |
| ubiquitous | 10 | |
| consistent | 10 | |
| 11 letters | ||
| unalterable | 11 | |
| undestroyed | 11 | |
| UNREMITTING | 11 | |
| undeviating | 11 | |
| 12 letters | ||
| unreturnable | 12 | |
| UNCHANGEABLE | 12 | |
| 13 letters | ||
| unsusceptible | 13 | |