| iron-hearted(adjective, bad, hard, tough, severe) |
| lackadaisical(adjective, temper, cold, negative, behave) |
| relentless(adjective, mean, hard, evil, nasty) |
| remorseless(adjective, mean, hard, harsh, violent) |
| sadistic(adjective, mean, evil, nasty, harsh) |
| senseless(adjective, bad, hard, tough, severe) |
| strict(adjective, tough, harsh, cruel, grim) |
| toneless(adjective, cool, temper, cold, negative) |
| unaffected(adjective, hard, tough, attitude, temper) |
| unexcitable(adjective, calm, cool, detached, blank) |
| unimpassioned(adjective, cool, tough, rational, straightforward) |
| unimpressionable(adjective, hard, careless, indifferent, cruel) |
| uninterested(adjective, temper, cold, negative, behave) |
| unkindly(adjective, bad, cold, aloof, no feelings) |
| adamant(adjective, person, mean, harsh, feelings) |
| blank(adjective, person, cool, feelings, detached) |
| bloodthirsty(adjective, evil, nasty, harsh, violent) |
| brutish(adjective, hard, evil, nasty, harsh) |
| calculated(adjective, careful, thoughtful, cautious, planned) |
| calm(adjective, cool, tough, rational, straightforward) |