| concrete(adjective, firm, stiff, hardened) |
| caked(adjective, firm, solid, stiff) |
| calcified(adjective, firm, solid, stiff) |
| cemented(verb, adjective, firm, solid) |
| compact(verb, adjective, reduce, firm) |
| compressed(verb, adjective, firm, solid) |
| congealed(adjective, firm, solid, hardened) |
| consolidated(adjective, firm, solid, hardened) |
| dried(adjective, firm, solid, hardened) |
| firm(adjective, solid, hardened, syrupy) |
| indurate(adjective, firm, solid, stiff) |
| monolithic(adjective, firm, solid, hardened) |
| petrified(adjective, firm, solid, hardened) |
| poured(adjective, firm, solid, hardened) |
| precast(adjective, firm, solid, stiff) |
| set in stone(expression, adjective, idiom, firm) |
| solidified(adjective, firm, solid, hardened) |
| steeled(adjective, firm, solid, hardened) |
| strong(adjective, firm, solid, hardened) |
| unyielding(adjective, firm, solid, hardened) |