Synonyms for Glacial (same or very similar meaning)
WordNet sense 1 (devoid of warmth and cordiality; expressive of unfriendliness or disdain):
frigid, frosty, frozen, icy, wintryWordNet sense 2 (extended meanings; especially of psychological coldness; without human warmth or emotion):
coldWordNet sense 3 (extremely cold):
arctic, gelid, polarFrom the ODE community, based on WordNetadd/edit