| dug in(expression, adjective, tough, firm, distant) |
| formal(adjective, tough, firm, fixed, distant) |
| hanging(adjective, determined, resolute, obstinate, uncompromising) |
| hard as nails(expression, adjective, idiom, tough, firm) |
| hardheaded(adjective, determined, resolute, obstinate, uncompromising) |
| hidebound(adjective, determined, resolute, obstinate, uncompromising) |
| hold the fort(expression, adjective, idiom, tough, firm) |
| hold the line(expression, adjective, idiom, tough, firm) |
| incompliant(adjective, tough, firm, fixed, distant) |
| intractable(adjective, tough, firm, fixed, distant) |
| locked in(expression, adjective, tough, firm, distant) |
| mulish(adjective, determined, resolute, obstinate, uncompromising) |
| pertinacious(adjective, determined, resolute, obstinate, uncompromising) |
| pig-headed(adjective, determined, resolute, obstinate, uncompromising) |
| reserved(adjective, tough, firm, fixed, distant) |
| single-minded(adjective, tough, firm, fixed, distant) |
| tenacious(adjective, determined, resolute, obstinate, uncompromising) |
| tough(adjective, determined, resolute, obstinate, uncompromising) |
| unflexible(adjective, tough, firm, fixed, distant) |
| uptight(adjective, tough, firm, fixed, distant) |