ungrammatical vs grammatical

ungrammatical and grammatical both are adjectives.

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

ungrammatical (adjective)	grammatical (adjective)
not grammatical; not conforming to the rules of grammar or accepted usage	conforming to the rules of grammar or usage accepted by native speakers
	of or pertaining to grammar