Definitions

from The American Heritage® Dictionary of the English Language, 4th Edition

  • adj. Not in accord with the rules of grammar.
  • adj. Not in accord with standard or socially prestigious linguistic usage.

from Wiktionary, Creative Commons Attribution/Share-Alike License

  • adj. 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 The Century Dictionary and Cyclopedia

  • Not according to the established rules of grammar.

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

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

Etymologies

un- +‎ grammatical (Wiktionary)

Examples

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