| firm(adjective, strong, sound, tough) |
| sound(adjective, strong, tough, solid) |
| staunch(adjective, strong, sound, tough) |
| vital(adjective, strong, tough, healthy) |
| active(adjective, strong, sound, tough) |
| built(strong, tough, healthy, well) |
| concentrated(strong, tough, healthy, well) |
| normal(strong, tough, fresh, well) |
| robustious(strong, tough, healthy, well) |
| robustuous(strong, tough, healthy, well) |
| rough(strong, tough, healthy, well) |
| substantial(adjective, strong, sound, tough) |
| tenacious(adjective, strong, sound, tough) |
| able(adjective, strong, sound, tough) |
| agile(adjective, thin, sinewy, sporty) |
| all right(expression, strong, tough, fresh) |
| boisterous(strong, tough, healthy, well) |
| booming(strong, tough, healthy, well) |
| capable(adjective, strong, sound, tough) |
| enduring(adjective, strong, sound, tough) |