| stoic(adjective, cool, blank, aloof, unemotional) |
| stoical(adjective, cool, blank, aloof, unemotional) |
| stolid(adjective, cool, blank, aloof, unemotional) |
| taciturn(adjective, cool, blank, aloof, unemotional) |
| thick-skinned(adjective, mean, hard, tough, harsh) |
| tough(adjective, mean, hard, harsh, inflexible) |
| tough nut to crack(expression, adjective, idiom, mean, hard) |
| trifling(adjective, calm, cool, relaxed, detached) |
| unbending(adjective, mean, hard, harsh, inflexible) |
| uncompassionate(adjective, mean, hard, tough, harsh) |
| uncompromising(adjective, mean, hard, tough, harsh) |
| unconcerned(adjective, calm, cool, relaxed, detached) |
| uncooperative(adjective, mean, hard, tough, harsh) |
| unemotional(adjective, calm, mean, hard, cool) |
| unexcitable(adjective, cool, blank, aloof, unemotional) |
| unexcited(adjective, calm, cool, relaxed, detached) |
| unfeeling(adjective, calm, mean, hard, cool) |
| unflappable(adjective, calm, cool, relaxed, casual) |
| unimpressionable |
| unmoved(adjective, cool, blank, aloof, unemotional) |