glacial vs icy

glacial and icy both are adjectives.

Word	Noun	Adjective	Verb	Adverb
glacial	No	Yes	No	No
icy	No	Yes	No	No

As adjectives, glacial and icy are synonyms defined as:

Other synonyms of glacial include arctic, frigid, gelid, polar.

As adjectives, glacial and icy are synonyms defined as:

glacial and icy: devoid of warmth and cordiality; expressive of unfriendliness or disdain

Other synonyms of glacial include frigid, frosty, frozen, wintry.

glacial (adjective)	icy (adjective)
relating to or derived from a glacier	extremely cold
extremely cold	devoid of warmth and cordiality; expressive of unfriendliness or disdain
devoid of warmth and cordiality; expressive of unfriendliness or disdain	covered with or containing or consisting of ice
	shiny and slick as with a thin coating of ice