ungrammatical vs incorrect

ungrammatical and incorrect both are adjectives.

Word	Noun	Adjective	Verb	Adverb
ungrammatical	No	Yes	No	No
incorrect	No	Yes	No	No

ungrammatical (adjective)	incorrect (adjective)
not grammatical; not conforming to the rules of grammar or accepted usage	not correct; not in conformity with fact or truth
	not in accord with established usage or procedure
	characterized by errors; not agreeing with a model or not following established rules
	(of a word or expression) not agreeing with grammatical principles