| fierce(adjective, animal, mean, severe, harsh) |
| forbidding(adjective, person, severe, indifferent, feelings) |
| halfhearted(adjective, mean, hard, cool, cold) |
| immovable(adjective, mean, hard, tough, harsh) |
| indurate(adjective, mean, bad, hard, cold) |
| insensate(adjective, bad, hard, tough, severe) |
| insentient(adjective, bad, hard, careless, cold) |
| intractable |
| invidious |
| iron-hearted(adjective, bad, hard, tough, severe) |
| laid back(expression, adjective, person, indifferent, detached) |
| marble(adjective, bad, cold, detached, aloof) |
| menacing(adjective, behavior, aroused negative, aroused awful feeling) |
| negative(adjective, opinion, description, judgement, judgmental) |
| rocky(pebbly, flinty) |
| selfish(adjective, opinion, description, unfeeling, insensible) |
| senseless(adjective, bad, hard, tough, severe) |
| steely(adjective, severe, harsh, unfeeling, strict) |
| stoic(adjective, impassive, laid-back, dispassionate, emotionless) |
| stolid |