| callous(verb, adjective, dull, close) |
| harden(verb, close, settle, continue) |
| firm(verb, adjective, close, fix) |
| cake(verb, close, fix, settle) |
| concrete(verb, adjective, close, firm) |
| temper(verb, close, fix, settle) |
| toughen(verb, close, fix, settle) |
| unyielding(adjective, mean, hard, firm) |
| congeal(verb, close, fix, settle) |
| ossify(verb, close, fix, hard) |
| petrify(verb, close, fix, settle) |
| solidify(verb, close, fix, settle) |
| steel(verb, dull, close, fix) |
| hardened(adjective, hard, firm, solid) |
| indurated(adjective, strong, hard, firm) |
| stiffen(verb, dull, close, fix) |
| strengthen(verb, dull, close, fix) |
| vitrify(verb, close, fix, settle) |
| acclimatize(verb, dull, close, develop) |
| calcify(verb, close, fix, settle) |