bootless vs vain

bootless and vain both are adjectives.

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

As adjectives, bootless and vain are synonyms defined as:

Other synonyms of bootless include fruitless, futile, sleeveless.

bootless (adjective)	vain (adjective)
unproductive of success	characteristic of false pride; having an exaggerated sense of self-importance
	unproductive of success