WordReference Random House Unabridged Dictionary of American English © 2026
un•gram•mat•i•cal
(un′grə mat′i kəl),USA pronunciation adj.
un′gram•mat′i•cal•ly, adv.
- Grammargrammatically incorrect or awkward;
not conforming to the rules or principles of grammar or accepted usage:an ungrammatical sentence.
- un-1 + grammatical 1645–55
'ungrammatical' also found in these entries (note: many are not synonyms or translations):