| heartless(adjective, mean, hard, cool, tough) |
| keen(adjective, cool, severe, sharp, intense) |
| numbing(adjective, cool, severe, keen, sharp) |
| severe(adjective, hard, cool, tough, severe) |
| stony(adjective, mean, hard, cool, tough) |
| unresponsive(adjective, mean, hard, cool, unpleasant) |
| Siberian(adjective, cool, severe, keen, sharp) |
| bleak(adjective, cool, severe, keen, sharp) |
| boreal(adjective, cool, severe, keen, sharp) |
| brumal(adjective, cool, severe, keen, sharp) |
| chilling(adjective, frozen) |
| crisp(adjective, cool, severe, keen, sharp) |
| forbidding(adjective, person, cool, cold, feelings) |
| frozen over(verb, expression, adjective, phrasal verb, state) |
| hyperborean(adjective, cool, severe, keen, sharp) |
| piercing(adjective, cool, severe, keen, sharp) |
| spiteful(adjective, person, unwarmhearted) |
| algid(adjective, cool, severe, keen, sharp) |
| brutal(adjective, person, hard, tough, severe) |
| cruel(adjective, person, mean, hard, cool) |