| unshakable(adjective, mean, hard, secure, firm) |
| unswayable(adjective, tough, firm, determined, distant) |
| obstinate(adjective, mean, hard, tough, firm) |
| stiff(adjective, determined, resolute, obstinate, uncompromising) |
| unyielding(adjective, set, mean, hard, secure) |
| hanging tough(expression, adjective, mean, hard, determined) |
| adamant(adjective, mean, hard, secure, determined) |
| steadfast(adjective, calm, strong, secure, firm) |
| pat(adjective, firm, solid, wild, determined) |
| unwavering(adjective, calm, strong, secure, firm) |
| tough(adjective, calm, mean, strong, hard) |
| carved in stone(adjective, fixed) |
| inelastic(adjective, tough, severe, firm, exact) |
| mulish(adjective, mean, hard, tough, difficult) |
| resistant(adjective, determined, resolute, obstinate, uncompromising) |
| dead set on(expression, adjective, idiom, secure, firm) |
| locked in(expression, adjective, secure, tough, severe) |
| permanent(adjective, calm, strong, steady, fixed) |
| pigheaded(adjective, mean, hard, tough, difficult) |
| single-minded(adjective, tough, firm, solid, cruel) |