| unfriendly(adjective, person, indifferent, negative, hostile) |
| unsentimental |
| cold-hearted(adjective, hard, tough, severe, cruel) |
| concrete(adjective, hardness) |
| corneous |
| dead(adjective, cool, unfriendly, aloof, distant) |
| dense(adjective, set, strong, hard, firm) |
| fixed(adjective, hard, firm, solid, stiff) |
| flat(poor, exhausted, lacking, wanting, bankrupt) |
| forbidding(adjective, person, feelings, emotions) |
| frosty(adjective, cool, hostile, unfriendly, aloof) |
| glacial(adjective, person, cool, feelings, unfriendly) |
| gravelly(adjective, rocky, pebbly, flinty, rock-strewn) |
| grim(adjective, mean, harsh, cruel, deep) |
| headstrong(adjective, tenacious) |
| immovable |
| impervious(adjective, unresponsive, oblivious, unmoved) |
| inhuman(adjective, mean, hard, tough, severe) |
| inhumane(adjective, mean, hard, harsh, cold) |
| inured(adjective, hard, careless, indifferent, cruel) |