| unsusceptible(adjective, hard, resist, unfeeling, unsympathetic) |
| unswayable(adjective, determined, resolute, obstinate, uncompromising) |
| up in arms(expression, idiom, opposition, resistance) |
| weatherproof |
| foul |
| benumbed(adjective, hard, firm, solid, unfeeling) |
| challenging(adjective, unwilling, opposed, defiant) |
| cohesive(adjective, strong, hard, solid, stiff) |
| confrontational(adjective, contentious, defiant) |
| contentious(adjective, contentious) |
| dense(adjective, strong, hard, solid, stiff) |
| disgusting |
| distasteful |
| fibrous(adjective, strong, hard, solid, stiff) |
| flinty(adjective, strong, hard, solid, stiff) |
| forced(adjective, difficult, awkward, averse, disinclined) |
| hard as nails(expression, adjective, idiom, strong, hard) |
| hardened(adjective, strong, hard, tough, fit) |
| hardhearted(adjective, hard, unfeeling, unsympathetic, hardened) |
| hermetic(unaffected, unyielding, unbending, impervious, unreceptive) |