| Rating | Solver | Clue |
|---|---|---|
| RIGOROUS | Severe or harsh | |
| ASTRINGENT | Severe or harsh | |
| STERN | Harsh, severe | |
| IRON | Rude; hard; harsh; severe. | |
| DURE | Hard; harsh; severe; rough; toilsome. | |
| GRIL | Harsh; hard; severe; stern; rough. | |
| STIFF | Harsh; disagreeable; severe; hard to bear. | |