| unyielding(adjective, mean, clear, strong, hard) |
| unrelenting(adjective, mean, strong, hard, tough) |
| hardheaded(adjective, strong, hard, tough, determined) |
| unbendable(adjective, determined, resolute, obstinate, uncompromising) |
| unbending(adjective, mean, clear, strong, hard) |
| adamant(adjective, mean, strong, hard, secure) |
| determined(adjective, resolute, impulsive, rigid, obstinate) |
| inexorable(adjective, mean, strong, hard, tough) |
| insistent(adjective, determined, resolute, obstinate, uncompromising) |
| relentless(adjective, mean, strong, hard, tough) |
| immovable(adjective, mean, strong, hard, secure) |
| firm(adjective, mean, clear, strong, hard) |
| fixed(adjective, mean, hard, secure, rough) |
| practical(adjective, sharp, realistic, shrewd) |
| realistic(adjective, sharp, practical, shrewd) |
| set in stone(expression, adjective, idiom, mean, hard) |
| stiff(adjective, hard, severe, rough, firm) |
| unshakable(adjective, mean, hard, secure, determined) |
| business-minded |
| mulish(adjective, mean, strong, hard, tough) |