| hardened(verb, adjective, hard, firm, solid) |
| tempered |
| toughened |
| anneal |
| stiff(adjective, hard, firm, rigid, inflexible) |
| annealing |
| anneals |
| arthritic(adjective, hard, firm, solid, tense) |
| benumbed(verb, adjective, hard, firm, solid) |
| brazed |
| brittle(adjective, hard, firm, solid, tense) |
| buckram(adjective, hard, firm, solid, tense) |
| cemented(verb, adjective, hard, firm, solid) |
| chilled(verb, adjective, hard, firm, solid) |
| congealed(verb, adjective, hard, firm, solid) |
| contracted(adjective, hard, firm, solid, tense) |
| creaky(adjective, hard, firm, solid, tense) |
| firm(adjective, hard, solid, stiff, rigid) |
| fixed(adjective, hard, firm, solid, stiff) |
| frozen(adjective, hard, firm, solid, tense) |