| impliable(adjective, hard, firm, solid, stiff) |
| incompliant(adjective, hard, firm, solid, tense) |
| indurate(adjective, hard, firm, solid, stiff) |
| inelastic(adjective, hard, firm, solid, stiff) |
| inflexible(adjective, hard, firm, solid, stiff) |
| jelled(adjective, hard, firm, solid, tense) |
| mechanical(adjective, hard, firm, solid, tense) |
| numbed(adjective, hard, firm, solid, tense) |
| ossified(adjective, hard, firm, solid, tense) |
| petrified(adjective, hard, firm, solid, tense) |
| refractory(adjective, hard, firm, solid, tense) |
| resistant(adjective, hard, firm, solid, tense) |
| rheumatic(adjective, hard, firm, solid, stiff) |
| rigid(adjective, hard, firm, solid, stiff) |
| set(adjective, hard, firm, solid, stiff) |
| solid(adjective, hard, firm, stiff, tense) |
| solidified(adjective, hard, firm, solid, tense) |
| starched(adjective, hard, firm, solid, stiff) |
| starchy(adjective, hard, firm, solid, tense) |
| stark(adjective, hard, firm, solid, tense) |