nongrammatical

/ˌnɑnɡrəˈmætɪkəl/
adjective
  1. Not following the rules of grammar; ungrammatical.
    • The editor corrected all nongrammatical phrases in the manuscript.
    • In casual speech, people often use nongrammatical constructions.
    • The teacher marked the nongrammatical sentence with a red pen.
Antonyms
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