| petrify(verb, close, set, fix, hard) |
| harden(verb, close, set, hard, settle) |
| stiffen(verb, calm, close, set, fix) |
| fossilize(verb, close, set, fix, hard) |
| congeal(verb, close, set, fix, hard) |
| indurate(verb, adjective, close, set, fix) |
| thicken(verb, close, set, fix, hard) |
| calcify(verb, close, set, fix, settle) |
| rigidify(verb, harden, solidify) |
| temper(verb, close, set, fix, settle) |
| toughen(verb, close, set, fix, settle) |
| vitrify(verb, close, set, fix, settle) |
| fossilise(verb, turn to bone) |
| freeze(verb, calm, close, set, fix) |
| solidify(verb, close, set, fix, hard) |
| anneal(verb, close, set, fix, settle) |
| callous(verb, adjective, close, set, fix) |
| firm(verb, calm, close, set, fix) |
| amalgamate(verb, close, set, fix, settle) |
| bake(verb, close, set, fix, settle) |