grammatical vs ungrammatical

grammatical and ungrammatical both are adjectives.

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

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