| intractable(adjective, control, order, strong, hard) |
| pigheaded(adjective, mean, hard, resist, deliberate) |
| stiff(adjective, hard, tough, rough, firm) |
| fixed(adjective, mean, hard, rough, firm) |
| inexorable(adjective, mean, hard, tough, firm) |
| pertinacious(adjective, mean, strong, tough, continue) |
| relentless(adjective, mean, strong, hard, tough) |
| steadfast(adjective, strong, tough, firm, intense) |
| hard(adjective, mean, rough, harsh, cruel) |
| perverse(adjective, mean, hard, difficult, cross) |
| unrelenting(adjective, mean, strong, hard, tough) |
| contumacious(adjective, deliberate, determined, negative, hostile) |
| persistent(adjective, strong, tough, continue, firm) |
| hard-nosed(adjective, mean, hard, tough, rough) |
| unwavering(adjective, firm, intense, deliberate, determined) |
| disobedient(adjective, cross, stubborn, willful, unruly) |
| resolved(adjective, firm, deliberate, determined, usual) |
| set(adjective, strong, tough, firm, determined) |
| unshakable(adjective, mean, strong, hard, tough) |
| wilful(adjective, determined, resolute, uncompromising, unshakeable) |