unsolvable vs insoluble

unsolvable and insoluble both are adjectives.

Word	Noun	Adjective	Verb	Adverb
unsolvable	No	Yes	No	No
insoluble	No	Yes	No	No

unsolvable (adjective)	insoluble (adjective)
not easily solved	(of a substance) incapable of being dissolved
	admitting of no solution or explanation
	without hope of solution