(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.

In an ungrammatical manner.

The state or quality of being ungrammatical.

plural of ungrammaticality

Synonym of ungrammatical

Not grammaticalized.

Not grammaticized.

The quality of being ungrammatical.

An error of grammar.

plural of ungrammaticism