| Solution | Length | |
|---|---|---|
| 4 letters | ||
| rapt | 4 | |
| 5 letters | ||
| rigid | 5 | |
| alone | 5 | |
| 6 letters | ||
| monist | 6 | |
| steady | 6 | |
| intent | 6 | |
| stable | 6 | |
| simple | 6 | |
| unwary | 6 | |
| single | 6 | |
| 7 letters | ||
| sincere | 7 | |
| serious | 7 | |
| 8 letters | ||
| tireless | 8 | |
| trusting | 8 | |
| UNTIRING | 8 | |
| SEDULOUS | 8 | |
| stubborn | 8 | |
| studious | 8 | |
| resolute | 8 | |
| bachelor | 8 | |
| swept-up | 8 | |
| 9 letters | ||
| tenacious | 9 | |
| bachelors | 9 | |
| UNWEARIED | 9 | |
| unguarded | 9 | |
| steadfast | 9 | |
| UNFAILING | 9 | |
| UNDAUNTED | 9 | |
| obsessive | 9 | |
| sleepless | 9 | |
| unbending | 9 | |
| 10 letters | ||
| UNFLAGGING | 10 | |
| UNSWERVING | 10 | |
| relentless | 10 | |
| determined | 10 | |
| unreserved | 10 | |
| UNWAVERING | 10 | |
| purposeful | 10 | |
| UNYIELDING | 10 | |
| 11 letters | ||
| unflinching | 11 | |
| unrelenting | 11 | |
| UNREMITTING | 11 | |
| uncompliant | 11 | |
| preoccupied | 11 | |
| unfaltering | 11 | |
| 12 letters | ||
| submerged-in | 12 | |
| MONOMANIACAL | 12 | |
| unsuspicious | 12 | |
| wholehearted | 12 | |
| SIMPLEMINDED | 12 | |
| 13 letters | ||
| UNINTERRUPTED | 13 | |
| UNCONQUERABLE | 13 | |
| wrapped up in | 13 | |
| 14 letters | ||
| UNCOMPROMISING | 14 | |
| 15 letters | ||
| UNSOPHISTICATED | 15 | |