frosty vs icy

frosty and icy both are adjectives.

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

As adjectives, frosty and icy are synonyms defined as:

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

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

frosty (adjective)	icy (adjective)
devoid of warmth and cordiality; expressive of unfriendliness or disdain	extremely cold
pleasantly cold and invigorating	devoid of warmth and cordiality; expressive of unfriendliness or disdain
covered with frost	covered with or containing or consisting of ice
	shiny and slick as with a thin coating of ice