Ungrammaticalness refers to the quality of being ungrammatical or not conforming to the rules of grammar. There are several synonyms that can be used to describe this quality, including grammatical errors, linguistic mistakes, incorrect syntax, improper grammar, faulty construction, flawed grammar, and linguistic inaccuracies. These terms can be used interchangeably to describe any instance of language use that does not adhere to the accepted rules of grammar. Whether it's a simple spelling error or a more complex issue with sentence structure, these synonyms allow speakers and writers to identify and correct mistakes in their language usage, ensuring that their communication is clear and effective.