| Solution | Length | |
|---|---|---|
| 3 letters | ||
| gym | 3 | |
| 4 letters | ||
| bold | 4 | |
| hard | 4 | |
| 5 letters | ||
| tough | 5 | |
| ought | 5 | |
| zippy | 5 | |
| rough | 5 | |
| vivid | 5 | |
| spiny | 5 | |
| vital | 5 | |
| steep | 5 | |
| eager | 5 | |
| 6 letters | ||
| strong | 6 | |
| tiring | 6 | |
| wicked | 6 | |
| ardent | 6 | |
| tricky | 6 | |
| easier | 6 | |
| taxing | 6 | |
| trying | 6 | |
| sticky | 6 | |
| robust | 6 | |
| uphill | 6 | |
| rugged | 6 | |
| thorny | 6 | |
| snappy | 6 | |
| severe | 6 | |
| 7 letters | ||
| zealous | 7 | |
| vibrant | 7 | |
| zestful | 7 | |
| arduous | 7 | |
| earnest | 7 | |
| serious | 7 | |
| slavish | 7 | |
| testing | 7 | |
| 8 letters | ||
| vehement | 8 | |
| ticklish | 8 | |
| TOILSOME | 8 | |
| exertion | 8 | |
| tireless | 8 | |
| spirited | 8 | |
| vigorous | 8 | |
| spanking | 8 | |
| SEDULOUS | 8 | |
| terrible | 8 | |
| strained | 8 | |
| resilute | 8 | |
| smacking | 8 | |
| rigorous | 8 | |
| 9 letters | ||
| exertions | 9 | |
| energetic | 9 | |
| trenchant | 9 | |
| gruelling | 9 | |
| wearisome | 9 | |
| UNWEARIED | 9 | |
| unsparing | 9 | |
| sleepless | 9 | |
| punishing | 9 | |
| vivacious | 9 | |
| 10 letters | ||
| UNFLAGGING | 10 | |
| relentless | 10 | |
| determined | 10 | |
| 11 letters | ||
| take-charge | 11 | |
| red-blooded | 11 | |
| UNREMITTING | 11 | |
| troublesome | 11 | |