| Rating | Solver | Clue |
|---|---|---|
| WATERPROOF | Rain-resistant | |
| SHOWERPROOF | Rain-resistant | |
| OVENPROOF | Heat-resistant | |
| SILEX | Heat-resistant | |
| AVERSE | Resistant | |
| IMMUNE | Resistant | |
| ASBESTOS | Fire-resistant material | |
| FIREPROOFED | Made blaze-resistant | |
| RECALCITRANT | Stubbornly resistant | |
| ZINC | Corrosion-resistant metal | |
| ORLON | Crease-resistant acrylic fabric | |
| PALM | Hurricane resistant tree | |
| KIKUYU | Drought resistant grass | |
| MULGA | Drought resistant tree | |
| MILO | Drought resistant grain sorghum | |
| DIEHARD | Obstinately resistant to change | |
| ELM | Tree with split- resistant wood | |
| RESISTIBILITY | The quality of being resistant; resitstance. | |
| ALDER | Rot resistant wood good for marine uses | |