| passionless(adjective, calm, dull, cool, flat) |
| rough(adjective, dull, hard, tough, severe) |
| stern(adjective, mean, hard, tough, severe) |
| stoic(adjective, calm, cool, tough, cold) |
| stolid(noun, adjective, calm, cool, tough) |
| unconscious(adjective, cold, indifferent, useful, fixed) |
| barbaric(adjective, animal, person, mean, cruel) |
| benumbed(adjective, hard, cruel, dead, unsympathetic) |
| brute(adjective, bad, rough, cold, cruel) |
| exacting(adjective, tough, severe, harsh, cruel) |
| hostile(adjective, mean, tough, harsh, cold) |
| phlegmatic(adjective, calm, cool, tough, indifferent) |
| relentless(adjective, animal, mean, hard, severe) |
| remorseless(adjective, animal, mean, hard, severe) |
| unkindly(adjective, adverb, bad, cold, aloof) |
| unyielding(adjective, mean, hard, severe, harsh) |
| anesthetized(adjective, cruel, dead, senseless, unsympathetic) |
| glacial(adjective, cool, cold, detached, blank) |
| impassible(adjective, bad, cold, aloof, insensibility) |
| impervious(noun, adjective, bad, cold, indifferent) |