nippy vs frosty

nippy and frosty both are adjectives.

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

As adjectives, nippy and frosty are synonyms defined as:

Other synonyms of nippy include crisp, nipping, snappy.

nippy (adjective)	frosty (adjective)
pleasantly cold and invigorating	devoid of warmth and cordiality; expressive of unfriendliness or disdain
a sharp biting taste	pleasantly cold and invigorating
	covered with frost