| crisp(adjective, tough, firm, fixed, distant) |
| distant(adjective, tough, firm, fixed, rigid) |
| do or die(expression, adjective, idiom, tough, firm) |
| formal(adjective, tough, firm, fixed, distant) |
| hard as nails(expression, adjective, idiom, tough, firm) |
| hold the fort(expression, adjective, idiom, tough, firm) |
| hold the line(expression, adjective, idiom, tough, firm) |
| incompliant(adjective, tough, firm, fixed, distant) |
| inelastic(adjective, tough, firm, fixed, distant) |
| inexorable(adjective, tough, firm, fixed, distant) |
| intractable(adjective, tough, firm, fixed, distant) |
| locked in(expression, adjective, secure, tough, firm) |
| reserved(adjective, tough, firm, fixed, distant) |
| resolute(adjective, secure, tough, firm, steady) |
| set in stone(expression, adjective, idiom, secure, tough) |
| single-minded(adjective, tough, firm, fixed, distant) |
| standing pat(expression, adjective, tough, firm, distant) |
| uncompromising(adjective, secure, tough, firm, steady) |
| unflexible(adjective, tough, firm, fixed, distant) |
| unswayable(adjective, tough, firm, fixed, distant) |