| unconcerned(adjective, hard, cool, careless, indifferent) |
| unemotional(adjective, hard, cool, blank, aloof) |
| unexcitable(adjective, cool, blank, aloof, unemotional) |
| unflappable(adjective, cool, blank, aloof, unemotional) |
| unimpressible(adjective, cool, blank, aloof, unemotional) |
| unimpressionable(adjective, hard, careless, indifferent, cruel) |
| unrepenting(adjective, hard, unfeeling, unsympathetic, hardened) |
| unresponsive(adjective, hard, careless, indifferent, cruel) |
| unruffled(adjective, cool, blank, aloof, unemotional) |
| unsubmissive(adjective, hard, unfeeling, unsympathetic, hardened) |
| unsusceptible(adjective, hard, careless, indifferent, cruel) |
| unsympathetic(adjective, hard, careless, indifferent, cruel) |
| vitrified |
| wooden(adjective, cool, blank, aloof, unemotional) |
| adamantine(adjective, set, strong, hard, firm) |
| aloof(adjective, cool, blank, unemotional, serene) |
| blank(adjective, unemotional, emotionless, expressionless, inexpressive) |
| caked |
| casehardened(adjective, hard, unfeeling, unsympathetic, hardened) |
| coarsened |