| unidealistic(adjective, hard, sound, simple, tough) |
| adamantine(adjective, strong, hard, tough, sturdy) |
| blank(adjective, person, feelings, emotions, rocky) |
| blunt(adjective, insensitive) |
| brutal(adjective, hard, tough, severe, sharp) |
| brutish(adjective, hard, cold, indifferent, unfeeling) |
| cold fish(expression, adjective, calm, mean, hard) |
| dull(noun, adjective, simple, tough, rational) |
| exacting(adjective, hard, tough, severe, rough) |
| expressionless(adjective, person, feelings, emotions, rocky) |
| frigid(adjective, detached, impassive, unresponsive, laid-back) |
| glacial(adjective, person, feelings, detached, impassive) |
| hard-headed |
| hard-line(adjective, strong, hard, tough, severe) |
| hostile(adjective, person, tough, harsh, feelings) |
| icy |
| impassible(adjective, bad, cold, aloof, no feelings) |
| intractable |
| no-nonsense(adjective, calm, simple, tough, severe) |
| oppressive(adjective, tough, severe, firm, harsh) |