| merciless(adjective, person, mean, hard, tough) |
| unfeeling(adjective, animal, calm, dull, mean) |
| unsympathetic(adjective, animal, mean, hard, cool) |
| callous(adjective, person, mean, hard, cool) |
| ruthless(adjective, animal, mean, hard, tough) |
| cruel(adjective, mean, hard, cool, tough) |
| heartless(adjective, mean, feeling, hard, cool) |
| pitiless(adjective, animal, mean, hard, tough) |
| stony(adjective, person, mean, hard, cool) |
| hard(adjective, mean, cool, tough, severe) |
| hardhearted(adjective, hard, careless, cold, indifferent) |
| insensitive(adjective, mean, hard, cool, tough) |
| unemotional(adjective, calm, dull, mean, hard) |
| unmerciful(adjective, mean, hard, tough, harsh) |
| cold-blooded(adjective, person, mean, hard, cool) |
| hard-boiled(adjective, person, mean, hard, careless) |
| unpitying(adjective, mean, hard, cool, unpleasant) |
| hardened(adjective, person, hard, tough, severe) |
| indifferent(adjective, calm, dull, mean, hard) |
| unforgiving(adjective, person, mean, feelings, unkind) |