| Solution | Length | |
|---|---|---|
| 3 letters | ||
| elm | 3 | |
| sos | 3 | |
| oak | 3 | |
| 4 letters | ||
| firm | 4 | |
| fast | 4 | |
| rude | 4 | |
| 5 letters | ||
| oaken | 5 | |
| hardy | 5 | |
| ninon | 5 | |
| sound | 5 | |
| solid | 5 | |
| tough | 5 | |
| stout | 5 | |
| burly | 5 | |
| hefty | 5 | |
| rigid | 5 | |
| vital | 5 | |
| 6 letters | ||
| stocky | 6 | |
| sinewy | 6 | |
| secure | 6 | |
| steady | 6 | |
| robust | 6 | |
| steely | 6 | |
| rugged | 6 | |
| strong | 6 | |
| stable | 6 | |
| 7 letters | ||
| durable | 7 | |
| staunch | 7 | |
| unasked | 7 | |
| organza | 7 | |
| 8 letters | ||
| stalwart | 8 | |
| resolute | 8 | |
| vigorous | 8 | |
| powerful | 8 | |
| thickset | 8 | |
| well-set | 8 | |
| wellmade | 8 | |
| stubborn | 8 | |
| forcible | 8 | |
| puissant | 8 | |
| 9 letters | ||
| well-made | 9 | |
| tenacious | 9 | |
| strapping | 9 | |
| 10 letters | ||
| well-built | 10 | |
| UNYIELDING | 10 | |
| 11 letters | ||
| jeanshallot | 11 | |
| SUBSTANTIAL | 11 | |
| heavyweight | 11 | |
| red-blooded | 11 | |
| VENTURESOME | 11 | |
| 13 letters | ||
| well-grounded | 13 | |
| strong willed | 13 | |