| mulish(adjective, tough, firm, difficult, awkward) |
| obstinate(adjective, tough, firm, difficult, fixed) |
| self-willed(adjective, tough, firm, difficult, wild) |
| tough(adjective, firm, difficult, informal, awkward) |
| untoward(adjective, stubborn) |
| annealed(adjective, hard, firm, solid, tense) |
| arthritic(adjective, hard, firm, solid, tense) |
| awkward(tough, difficult, wild, obstinate, stubborn) |
| bad |
| benumbed(adjective, hard, firm, solid, tense) |
| brittle(adjective, hard, firm, solid, tense) |
| buckram(adjective, hard, firm, solid, tense) |
| bullheaded(adjective, stubborn) |
| cemented(adjective, hard, firm, solid, tense) |
| chilled(adjective, hard, firm, solid, tense) |
| congealed(adjective, hard, firm, solid, tense) |
| contracted(adjective, hard, firm, solid, tense) |
| creaky(adjective, hard, firm, solid, tense) |
| crisp(adjective, tough, firm, fixed, distant) |
| dead set(adjective, determined, resolute, uncompromising, unshakeable) |