| Solution | Length | |
|---|---|---|
| 4 letters | ||
| same | 4 | |
| firm | 4 | |
| EVEN | 4 | |
| sure | 4 | |
| 5 letters | ||
| rigid | 5 | |
| rapid | 5 | |
| solid | 5 | |
| rocky | 5 | |
| 6 letters | ||
| strong | 6 | |
| torpid | 6 | |
| steady | 6 | |
| prolix | 6 | |
| stable | 6 | |
| static | 6 | |
| smooth | 6 | |
| 7 letters | ||
| onenote | 7 | |
| stabile | 7 | |
| regular | 7 | |
| uniform | 7 | |
| routine | 7 | |
| equable | 7 | |
| tedious | 7 | |
| 8 letters | ||
| monotone | 8 | |
| unfading | 8 | |
| constant | 8 | |
| repeated | 8 | |
| singsong | 8 | |
| staccato | 8 | |
| unbroken | 8 | |
| 9 letters | ||
| unruffled | 9 | |
| VIBRATING | 9 | |
| unstopped | 9 | |
| unchecked | 9 | |
| UNFAILING | 9 | |
| unaltered | 9 | |
| pulsating | 9 | |
| sustained | 9 | |
| unceasing | 9 | |
| robotlike | 9 | |
| REMAINING | 9 | |
| quiescent | 9 | |
| steadfast | 9 | |
| 10 letters | ||
| repetitive | 10 | |
| UNCHANGING | 10 | |
| UNEVENTFUL | 10 | |
| consistent | 10 | |
| stationary | 10 | |
| stuttering | 10 | |
| SYSTEMATIC | 10 | |
| 11 letters | ||
| unalterable | 11 | |
| undestroyed | 11 | |
| UNREMITTING | 11 | |
| undeviating | 11 | |
| 12 letters | ||
| UNCHANGEABLE | 12 | |
| unreturnable | 12 | |
| 13 letters | ||
| unsusceptible | 13 | |
| UNINTERRUPTED | 13 | |
| 14 letters | ||
| unintermittent | 14 | |
| 16 letters | ||
| undifferentiated | 16 | |