| compact(adjective, characteristic, hard, tough) |
| solid(adjective, characteristic, person, body) |
| heavy(adjective, person, dull, body) |
| firm(noun, adjective, strong, hard) |
| impenetrable(adjective, characteristic, hard, tough) |
| close(adjective, hard, tough, firm) |
| compressed(adjective, hard, tough, firm) |
| condensed(adjective, hard, tough, solid) |
| crowded(adjective, firm, solid, heavy) |
| opaque(adjective, dull, solid, dark) |
| stiff(adjective, strong, hard, tough) |
| substantial(adjective, strong, hard, tough) |
| concentrated(adjective, strong, hard, tough) |
| concrete(adjective, hard, tough, solid) |
| deep(adjective, solid, dark, heavy) |
| rigid(adjective, strong, hard, tough) |
| tough(adjective, person, body, strong) |
| unyielding(adjective, strong, hard, tough) |
| impermeable(adjective, hard, tough, firm) |
| strong(adjective, person, body, hard) |