| intense(adjective, strong, great, tough, firm) |
| intrepid |
| inured(strong, fit, healthy, well, robust) |
| kinetic(adjective, strong, moving, energetic, lively) |
| normal(strong, tough, fit, fresh, well) |
| permanent(adjective, calm, strong, tough, steady) |
| powerfully built(expression, adjective, person, body, strong) |
| real(adjective, substantial) |
| reinforced(adjective, strong, sound, tough, solid) |
| robustuous(strong, tough, fit, healthy, well) |
| rock-solid(adjective, hard, compact, dense, rock-hard) |
| rosy-cheeked(adjective, person, strong, tough, fit) |
| rough(adjective, strong, hard, tough, vigorous) |
| serviceable |
| set(adjective, calm, strong, hard, tough) |
| solid as a rock(expression, adjective, idiom, calm, strong) |
| stanch |
| strenuous(adjective, strong, tough, intense, energetic) |
| tangible(adjective, substantial) |
| thick(adjective, person, close, set, body) |