WordNet sense 1 (not giving or reciprocating affection):

unloving

WordNet sense 2 (devoid of warmth and cordiality; expressive of unfriendliness or disdain):

frosty, frozen, glacial, icy, wintry

WordNet sense 3 (extended meanings; especially of psychological coldness; without human warmth or emotion):

cold

WordNet sense 4 (extremely cold):

arctic, gelid, polar