In a glacial manner; at a very slow pace like the movement of glaciers, or in a cold and unfriendly way.
From glacial (relating to ice or glaciers) combined with the suffix -ly making an adverb. Can refer literally to glacier speed or metaphorically to cold behavior.
Glaciers move only inches per year, so when someone says a process moves 'glacially,' they mean it's incredibly slow—your high school cafeteria line moving glacially is a great comparison!
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