| Answer | Crossword Clue |
|---|---|
| INURES | Toughens |
| ANNEALS | Toughens |
| STEELS | Toughens |
| ENURES | Toughens. |
| INURES | Toughens. |
| ENURES | Toughens |
| STEELS | Toughens (oneself) |
| ENSTEELS | Toughens up |
| ANNEALS | Toughens, as metal |
| INURES | Toughens by exposure |
| toughener | something that toughens |
| tougheners | TOUGHENER, something that toughens |
