"glacial" in the adjective sense
1. glacial
relating to or derived from a glacier
"glacial deposit"
2. frigid, frosty, frozen, glacial, icy, wintry
devoid of warmth and cordiality expressive of unfriendliness or disdain
"a frigid greeting"
"got a frosty reception"
"a frozen look on their faces"
"a glacial handshake"
"icy stare"
"wintry smile"
3. arctic, frigid, gelid, glacial, icy, polar
extremely cold
"an arctic climate"
"a frigid day"
"gelid waters of the North Atlantic"
"glacial winds"
"icy hands"
"polar weather"
Source: WordNet® (An amazing lexical database of English)
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