| Solution | Length | |
|---|---|---|
| 4 letters | ||
| fast | 4 | |
| 5 letters | ||
| vital | 5 | |
| tough | 5 | |
| solid | 5 | |
| rigid | 5 | |
| 6 letters | ||
| torpid | 6 | |
| static | 6 | |
| stable | 6 | |
| 7 letters | ||
| eternal | 7 | |
| undying | 7 | |
| 8 letters | ||
| amaranth | 8 | |
| 9 letters | ||
| evergreen | 9 | |
| UNFAILING | 9 | |
| unaltered | 9 | |
| unchecked | 9 | |
| quiescent | 9 | |
| UNVARYING | 9 | |
| REMAINING | 9 | |
| sustained | 9 | |
| steadfast | 9 | |
| 10 letters | ||
| UNCHANGING | 10 | |
| stationary | 10 | |
| 11 letters | ||
| undestroyed | 11 | |
| 12 letters | ||
| UNCHANGEABLE | 12 | |