| sinewy(adjective, strong, sound, tough, solid) |
| sound(adjective, strong, tough, solid, heavy) |
| stable(adjective, strong, sound, tough, solid) |
| stalwart(adjective, strong, sound, tough, solid) |
| stark(adjective, strong, sound, tough, solid) |
| staunch(adjective, strong, sound, tough, solid) |
| steady(adjective, strong, sound, tough, solid) |
| stout(adjective, strong, sound, tough, solid) |
| strapping(adjective, strong, great, sound, tough) |
| super colossal(expression, fat, highpowered, tremendous, mondo) |
| tenacious(adjective, strong, sound, tough, solid) |
| unyielding(adjective, strong, sound, tough, solid) |
| vigorous(adjective, strong, sound, tough, solid) |
| well-founded(adjective, strong, sound, tough, solid) |
| well-made(adjective, strong, sound, tough, solid) |
| cast-iron |
| constitute |
| defensible |
| dependable |
| estimable(highpowered, mondo) |