| Solution | Length | |
|---|---|---|
| 4 letters | ||
| legs | 4 | |
| guts | 4 | |
| GRIT | 4 | |
| 5 letters | ||
| spunk | 5 | |
| sinew | 5 | |
| vigor | 5 | |
| 6 letters | ||
| mettle | 6 | |
| spirit | 6 | |
| energy | 6 | |
| 8 letters | ||
| strength | 8 | |
| vitality | 8 | |
| tenacity | 8 | |
| 9 letters | ||
| tolerance | 9 | |
| endurance | 9 | |
| stiffness | 9 | |
| TOUGHNESS | 9 | |
| stability | 9 | |
| 10 letters | ||
| resistance | 10 | |
| sturdiness | 10 | |
| resolution | 10 | |
| 12 letters | ||
| stayingpower | 12 | |
| stubbornness | 12 | |
| 13 letters | ||
| PREOCCUPATION | 13 | |
| staying-power | 13 | |
| 14 letters | ||
| relentlessness | 14 | |