from The American Heritage® Dictionary of the English Language, 5th Edition.

  • adjective Not in accord with the rules of grammar.

from The Century Dictionary.

  • Not according to the established rules of grammar.

from Wiktionary, Creative Commons Attribution/Share-Alike License.

  • adjective linguistics In violation of one or more of the rules and conventions of a language as defined by the grammar, resulting in unacceptable, or incorrect usage.

from WordNet 3.0 Copyright 2006 by Princeton University. All rights reserved.

  • adjective not grammatical; not conforming to the rules of grammar or accepted usage


from Wiktionary, Creative Commons Attribution/Share-Alike License

un- +‎ grammatical


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