| solid(adjective, hard, firm, stiff, tense) |
| solidified(adjective, hard, firm, solid, tense) |
| standing pat(expression, adjective, tough, firm, distant) |
| starched(adjective, hard, firm, solid, stiff) |
| starchy(adjective, hard, firm, solid, tense) |
| stark(adjective, hard, firm, solid, tense) |
| stony(adjective, hard, firm, solid, stiff) |
| taut(adjective, hard, firm, solid, stiff) |
| tense(adjective, hard, firm, solid, stiff) |
| thick(adjective, hard, firm, solid, stiff) |
| thickened(adjective, hard, firm, solid, stiff) |
| tight(adjective, hard, firm, solid, stiff) |
| unalterable |
| uncompromising(adjective, tough, firm, fixed, distant) |
| ungiving |
| ungraceful(adjective, hard, firm, solid, tense) |
| unpliable |
| unswayable(adjective, tough, firm, fixed, distant) |
| uptight(adjective, tough, firm, fixed, distant) |
| wooden(adjective, hard, firm, solid, tense) |