glacial
gla-cial
adjective
Extremely slow or gradual in movement, progress, or change.
"Progress on the new policy was glacial."
adjective
Extremely cold, or unfriendly and hostile in manner.
"She gave him a glacial stare."
adjective
Relating to, caused by, or resembling glaciers or ice.
"The valley showed clear signs of glacial erosion."
Thesaurus
Synonyms: frozen, frigid, cold, icy, frosty, wintry, gelid, polar, arctic