| callous(verb, adjective, dull, close, set) |
| harden(verb, close, set, settle, continue) |
| firm(verb, adjective, close, set, fix) |
| inure(verb, dull, develop, rough, adjust) |
| set(verb, adjective, close, fix, hard) |
| cake(verb, close, set, fix, settle) |
| concrete(verb, adjective, close, set, firm) |
| hard(adjective, mean, firm, solid, stiff) |
| obdurate(adjective, determined, resolute, stubborn, uncompromising) |
| temper(verb, close, set, fix, settle) |
| toughen(verb, close, set, fix, settle) |
| unyielding(adjective, set, mean, hard, firm) |
| congeal(verb, close, set, fix, settle) |
| ossify(verb, close, set, fix, hard) |
| petrify(verb, close, set, fix, settle) |
| solidify(verb, close, set, fix, settle) |
| steel(verb, dull, close, set, fix) |
| hardened(adjective, set, hard, firm, solid) |
| indurated(adjective, set, strong, hard, firm) |
| inexorable(adjective, mean, hard, determined, resolute) |