unenviable vs undesirable

unenviable is not a noun while undesirable is a noun.

Word	Noun	Adjective	Verb	Adverb
unenviable	No	Yes	No	No
undesirable	Yes	Yes	No	No

unenviable (noun)	undesirable (noun)
	one whose presence is undesirable

unenviable (adjective)	undesirable (adjective)
hard to deal with; especially causing pain or embarrassment	not wanted
so undesirable as to be incapable of arousing envy	not worthy of being chosen (especially as a spouse)