| impliable(adjective, hard, firm, solid, stiff) |
| incompliant(adjective, hard, tough, firm, solid) |
| indurate(adjective, hard, firm, solid, stiff) |
| inexorable(adjective, tough, firm, fixed, distant) |
| jelled(adjective, hard, firm, solid, tense) |
| locked in(expression, adjective, tough, firm, distant) |
| mechanical(adjective, hard, firm, solid, tense) |
| nonelastic |
| numbed(adjective, hard, firm, solid, tense) |
| obstinate(adjective, tough, firm, fixed, rigid) |
| ossified(adjective, hard, firm, solid, tense) |
| petrified(adjective, hard, firm, solid, tense) |
| refractory(adjective, hard, firm, solid, tense) |
| reserved(adjective, tough, firm, fixed, distant) |
| resistant(adjective, hard, firm, solid, tense) |
| resolute(adjective, tough, firm, fixed, distant) |
| rheumatic(adjective, hard, firm, solid, stiff) |
| set(adjective, hard, firm, solid, stiff) |
| set in stone(expression, adjective, idiom, tough, firm) |
| single-minded(adjective, tough, firm, fixed, distant) |