| staunch(adjective, calm, strong, sound, secure) |
| well-constructed |
| well-founded(adjective, calm, strong, sound, secure) |
| wiry |
| adamantine(adjective, strong, tough, firm, stiff) |
| big(adjective, strong, sound, tough, solid) |
| bulky(strong, solid, significant, large, robust) |
| continual(adjective, stable, constant, enduring, lasting) |
| coriaceous(adjective, hard) |
| dense(adjective, strong, hard, firm, solid) |
| faithful(firm, true, fixed, constant, steadfast) |
| generous(adjective, significant, large, considerable) |
| gristly |
| hard as nails(expression, adjective, idiom, strong, hard) |
| healthy(adjective, strong, hard, solid, heavy) |
| heavy(adjective, strong, sound, tough, solid) |
| husky |
| immobile(strong, secure, substantial, stable, unmoving) |
| in fine feather(expression, adjective, idiom, strong, sound) |
| in rugged(expression, idiom) |