grammatically incorrect or awkward; not conforming to the rules or principles of grammar or accepted usage: an ungrammatical sentence.

1645–55; un-1 + grammatical

ungrammatically, adverb
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World English Dictionary
ungrammatical (ˌʌnɡrəˈmætɪkəl)
(of a sentence) not regarded as correct by native speakers of the language

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Word Origin & History

1654, from un- (1) "not" + grammatical (see grammar).
Online Etymology Dictionary, © 2010 Douglas Harper
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Example sentences
But here, in prose, his style has collapsed into ungrammatical imprecision.
He spoke in an ungrammatical way and his intellectual poverty was quite
Thus, systems will be asked to handle real text that may include typographical
  errors and ungrammatical sentences.
In spontaneous conversations people sometimes use ungrammatical sentences
  because of nervousness or hesitation.
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