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