Relevance ranks synonyms and suggests the best matches based on how closely a synonym’s sense matches the sense you selected.
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Synonyms for un-grammatical

adj not using the correct rules of grammar

Antonyms for un-grammatical

Roget's 21st Century Thesaurus, Third Edition Copyright © 2013 by the Philip Lief Group.
Roget's 21st Century Thesaurus, Third Edition Copyright © 2013 by the Philip Lief Group.