| unresponsive(adjective, hard, careless, indifferent, cruel) |
| unseeing |
| unsusceptible(adjective, hard, careless, indifferent, cruel) |
| unsympathetic(adjective, hard, careless, indifferent, cruel) |
| unwilling |
| witless |
| accustomed(adjective, hard, unfeeling, unsympathetic, hardened) |
| benumbed(adjective, hard, unfeeling, unsympathetic, hardened) |
| brutish(adjective, inconscient, nirvanic, inconversant, amnemonic) |
| casehardened(adjective, hard, unfeeling, unsympathetic, hardened) |
| cold-hearted(adjective, unfeeling, unsympathetic, uncaring, insensitive) |
| coldblooded(adjective, careless, apathetic, unsympathetic, insensitive) |
| coldhearted(adjective, hard, unfeeling, unsympathetic, hardened) |
| cynical(adjective, hard, unfeeling, unsympathetic, hardened) |
| detached(adjective, woolgathering, disjointed, inconscient, inconversant) |
| disdainful(adjective, hard, unfeeling, unsympathetic, hardened) |
| habituated(adjective, hard, unfeeling, unsympathetic, hardened) |
| hard-as-nails(adjective, hard, unfeeling, unsympathetic, hardened) |
| hard-nosed(adjective, hard, unfeeling, unsympathetic, hardened) |
| hard as nails(expression, adjective, idiom, callous, disciplined) |