| Solution | Length | |
|---|---|---|
| 3 letters | ||
| ARC | 3 | |
| 4 letters | ||
| saga | 4 | |
| rapt | 4 | |
| 5 letters | ||
| solid | 5 | |
| rigid | 5 | |
| tough | 5 | |
| vital | 5 | |
| 6 letters | ||
| serial | 6 | |
| static | 6 | |
| smooth | 6 | |
| steady | 6 | |
| torpid | 6 | |
| stable | 6 | |
| 7 letters | ||
| UNENDED | 7 | |
| gradual | 7 | |
| andsoon | 7 | |
| serried | 7 | |
| lasting | 7 | |
| uniform | 7 | |
| running | 7 | |
| undying | 7 | |
| abiding | 7 | |
| ongoing | 7 | |
| 8 letters | ||
| unfading | 8 | |
| standing | 8 | |
| resolute | 8 | |
| pilingon | 8 | |
| stubborn | 8 | |
| resuming | 8 | |
| seamless | 8 | |
| unbroken | 8 | |
| straight | 8 | |
| tireless | 8 | |
| UNTIRING | 8 | |
| SEDULOUS | 8 | |
| unending | 8 | |
| 9 letters | ||
| sleepless | 9 | |
| UNDAUNTED | 9 | |
| unaltered | 9 | |
| UNVARYING | 9 | |
| unstopped | 9 | |
| UNFAILING | 9 | |
| unchecked | 9 | |
| sustained | 9 | |
| steadfast | 9 | |
| quiescent | 9 | |
| tenacious | 9 | |
| unceasing | 9 | |
| REMAINING | 9 | |
| recurrent | 9 | |
| UNWEARIED | 9 | |
| 10 letters | ||
| unrelieved | 10 | |
| stationary | 10 | |
| relentless | 10 | |
| repetitive | 10 | |
| UNCHANGING | 10 | |
| UNFLAGGING | 10 | |
| UNSWERVING | 10 | |
| UNWAVERING | 10 | |
| 11 letters | ||
| unrelenting | 11 | |
| unfaltering | 11 | |
| PROGRESSIVE | 11 | |
| undestroyed | 11 | |
| UNREMITTING | 11 | |
| unflinching | 11 | |
| preoccupied | 11 | |
| 12 letters | ||
| UNCHANGEABLE | 12 | |
| goingconcern | 12 | |
| 13 letters | ||
| UNINTERRUPTED | 13 | |
| UNCONQUERABLE | 13 | |
| single-minded | 13 | |
| 14 letters | ||
| unintermittent | 14 | |
| 16 letters | ||
| undifferentiated | 16 | |