futile vs fruitless

futile and fruitless both are adjectives.

Word	Noun	Adjective	Verb	Adverb
futile	No	Yes	No	No
fruitless	No	Yes	No	No

As adjectives, futile and fruitless are synonyms defined as:

Other synonyms of futile include bootless, sleeveless, vain.

futile (adjective)	fruitless (adjective)
unproductive of success	unproductive of success
producing no result or effect