| Solution | Length | |
|---|---|---|
| 4 letters | ||
| iwas | 4 | |
| test | 4 | |
| hard | 4 | |
| 5 letters | ||
| avoid | 5 | |
| trial | 5 | |
| rough | 5 | |
| ESING | 5 | |
| tight | 5 | |
| 6 letters | ||
| taxing | 6 | |
| tiring | 6 | |
| 7 letters | ||
| onerous | 7 | |
| irksome | 7 | |
| testing | 7 | |
| r and d | 7 | |
| 8 letters | ||
| wretched | 8 | |
| tiresome | 8 | |
| ESSAYING | 8 | |
| rigorous | 8 | |
| wearying | 8 | |
| untoward | 8 | |
| TOILSOME | 8 | |
| sinister | 8 | |
| 9 letters | ||
| punishing | 9 | |
| tentative | 9 | |
| troublous | 9 | |
| vexatious | 9 | |
| straining | 9 | |
| WEAKENING | 9 | |
| wearisome | 9 | |
| stressful | 9 | |
| 10 letters | ||
| ATTEMPTING | 10 | |
| bothersome | 10 | |
| 11 letters | ||
| UNFAVORABLE | 11 | |
| troublesome | 11 | |
| provisional | 11 | |
| takingastab | 11 | |
| 12 letters | ||
| probationary | 12 | |
| 13 letters | ||
| rule of thumb | 13 | |
| allinadaswork | 13 | |
| 15 letters | ||
| trial-and-error | 15 | |
| 24 letters | ||
| research and development | 24 | |