| heartless(adjective, mean, feeling, hard, cool) |
| unfeeling(noun, adjective, dull, mean, bad) |
| insensitive(noun, adjective, dull, quiet, mean) |
| cold(adjective, calm, mean, hard, cool) |
| unsympathetic(adjective, quiet, mean, bad, hard) |
| hard(adjective, mean, hard, cool, tough) |
| insensible(adjective, quiet, bad, hard, cool) |
| indifferent(adjective, calm, quiet, mean, hard) |
| cruel(adjective, mean, hard, cool, tough) |
| cold-blooded(adjective, person, mean, bad, hard) |
| ruthless(adjective, mean, hard, tough, severe) |
| apathetic(adjective, person, quiet, mean, hard) |
| tough(noun, adjective, mean, hard, cool) |
| stony(adjective, person, mean, hard, cool) |
| hard-boiled(noun, adjective, calm, person, mean) |
| hard-hearted(adjective, calm, mean, bad, hard) |
| uncaring(adjective, mean, bad, hard, cool) |
| hardened(noun, adjective, person, hard, cool) |
| unemotional(adjective, mean, hard, cool, tough) |
| cool(adjective, calm, mean, hard, unpleasant) |