| severe(adjective, hard, cool, tough, keen) |
| bitter(adjective, hard, cool, tough, severe) |
| bleak(adjective, cool, tough, severe, keen) |
| keen(adjective, cool, severe, sharp, intense) |
| cutting(adjective, cool, severe, keen, sharp) |
| frigid(adjective, cool, severe, keen, sharp) |
| icy(adjective, cool, severe, keen, sharp) |
| piercing(adjective, cool, severe, keen, sharp) |
| wintry(adjective, cool, severe, keen, sharp) |
| algid(adjective, cool, severe, keen, sharp) |
| biting(adjective, cool, severe, keen, sharp) |
| gelid(adjective, cool, severe, keen, sharp) |
| chilly(adjective, cool, severe, keen, sharp) |
| cool(adjective, severe, keen, sharp, intense) |
| intense(adjective, cool, severe, keen, sharp) |
| nipping(adjective, cool, severe, keen, sharp) |
| arctic(adjective, cool, severe, keen, sharp) |
| below zero(expression, cool, severe, keen, sharp) |
| boreal(adjective, cool, severe, keen, sharp) |
| brisk(adjective, cool, severe, keen, sharp) |