| Solution | Length | |
|---|---|---|
| 4 letters | ||
| rapt | 4 | |
| firm | 4 | |
| sure | 4 | |
| 5 letters | ||
| stoic | 5 | |
| stern | 5 | |
| rocky | 5 | |
| solid | 5 | |
| sound | 5 | |
| 6 letters | ||
| steely | 6 | |
| unawed | 6 | |
| stable | 6 | |
| secure | 6 | |
| steady | 6 | |
| 7 letters | ||
| relaxed | 7 | |
| staunch | 7 | |
| 8 letters | ||
| reliable | 8 | |
| unshaken | 8 | |
| ruthless | 8 | |
| UNTIRING | 8 | |
| SEDULOUS | 8 | |
| stalwart | 8 | |
| resolute | 8 | |
| stubborn | 8 | |
| tireless | 8 | |
| 9 letters | ||
| tenacious | 9 | |
| UNFAILING | 9 | |
| UNDAUNTED | 9 | |
| sleepless | 9 | |
| unabashed | 9 | |
| UNWEARIED | 9 | |
| steadfast | 9 | |
| 10 letters | ||
| UNSWERVING | 10 | |
| UNWAVERING | 10 | |
| UNYIELDING | 10 | |
| UNFLAGGING | 10 | |
| UNSHAKABLE | 10 | |
| unblinking | 10 | |
| UNSTRAINED | 10 | |
| determined | 10 | |
| relentless | 10 | |
| 11 letters | ||
| preoccupied | 11 | |
| UNFLAPPABLE | 11 | |
| unfaltering | 11 | |
| unblenching | 11 | |
| UNREMITTING | 11 | |
| predictable | 11 | |
| unrelenting | 11 | |
| unshrinking | 11 | |
| SUBSTANTIAL | 11 | |
| 12 letters | ||
| UNHESITATING | 12 | |
| unappeasable | 12 | |
| 13 letters | ||
| UNCONQUERABLE | 13 | |
| UNINTERRUPTED | 13 | |
| single-minded | 13 | |
| WELL BALANCED | 13 | |