56 entries under stiff topic. ×
| ossified(adjective, set, solid, heavy, deep) | |
| rocklike(adjective, strong, hard, firm, substantial) | |
| ropy(heavy, thick, dense, jellied) | |
| syrupy(adjective, set, solid, heavy, deep) | |
| tough(adjective, set, strong, hard, firm) | |
| turbid(adjective, set, solid, heavy, deep) | |
| vitrified(adjective, set, solid, heavy, deep) | |
| adamantine(adjective, set, strong, hard, firm) | |
| callous(adjective, set, strong, hard, firm) | |
| durable(adjective, firm, rigid) | |
| indurate(adjective, set, strong, hard, firm) | |
| indurated(adjective, set, strong, hard, firm) | |
| iron(adjective, set, strong, hard, firm) | |
| rocky(adjective, set, strong, hard, firm) | |
| stony(adjective, set, strong, hard, firm) | |
| unbreakable(adjective, firm, rigid) |
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