WordNet sense 1 (devoid of warmth and cordiality; expressive of unfriendliness or disdain):

frigid, frosty, frozen, glacial, icy

WordNet sense 2 (extended meanings; especially of psychological coldness; without human warmth or emotion):

cold

WordNet sense 3 (characteristic of or relating to winter):

brumal

WordNet sense 4 (characteristic of or occurring in winter):

wintery