| stubborn(adjective, characteristic, quality, strong, hard) |
| mulish(adjective, strong, hard, tough, firm) |
| unyielding(adjective, strong, hard, tough, determined) |
| hard-nosed(adjective, strong, hard, tough, determined) |
| headstrong(adjective, strong, tough, firm, resist) |
| obstinate(adjective, strong, resist, cold, determined) |
| pigheaded(adjective, tough, firm, resist, determined) |
| bullheaded(adjective, strong, hard, tough, resist) |
| inflexible(adjective, strong, hard, tough, cold) |
| dogged(adjective, tough, firm, resist, determined) |
| pertinacious(adjective, strong, tough, resist, cold) |
| willful(adjective, tough, firm, resist, determined) |
| obdurate(adjective, strong, hard, tough, determined) |
| practical(adjective, hard, sound, tough, reasonable) |
| pragmatic(adjective, hard, sound, reasonable, excite) |
| hard(adjective, strong, sound, tough, reasonable) |
| rational(adjective, hard, sound, reasonable, sensible) |
| realistic(adjective, hard, sound, reasonable, sharp) |
| resolute(adjective, determined, obstinate, uncompromising, unshakeable) |
| rigid(adjective, strong, hard, tough, determined) |