unproductive vs vain

unproductive and vain both are adjectives.

Word	Noun	Adjective	Verb	Adverb
unproductive	No	Yes	No	No
vain	No	Yes	No	No

unproductive (adjective)	vain (adjective)
not producing or capable of producing	characteristic of false pride; having an exaggerated sense of self-importance
not producing desired results	unproductive of success