| Answer | Crossword Clue |
|---|---|
| FIBER | Basic toughness |
| RIGOR | Toughness |
| SINEW | Toughness |
| STEEL | Toughness |
| GRIT | Toughness |
| GRIT | Moral toughness |
| NAILS | Symbols of toughness |
| NAILS | Epitome of toughness |
| GRITTY | Showing some toughness |
| HARDEDGE | Toughness in manner |
| NAILS | Symbol of toughness |
| STEEL | Toughness of nerve |
| NAILS | Exemplar of toughness |
| NAILS | Exemplars of toughness |
| SINEW | Source of toughness |
| STEEL | Symbol of toughness |
| KEGOFNAILS | Cincinnati-Louisville game trophy symbolizing toughness |
| NYLON | Synthetic polyamide characterized by toughness and elasticity. |
