ungrammatical.

Not conforming to the grammatical system or rules of the language or variety under consideration.

Use it for

Words that belong together

• ungrammatical construction
• ungrammatical sequence

On the page

The ungrammatical sequence violated the dependency the analysis had specified.

The editor distinguished an ungrammatical construction from a merely unusual style.

Usage notes

Primary category: academic / formal. Forms: Relational or grammatical-status adjective; ordinary degree comparison only where the characteristic genuinely allows it. Legacy lexical fields mirror sense 1 only. Use numbered sense fields for all meanings. Established modern English lexical item. No separate regional spelling or grammatical inflection entry. Writing functions: language analysis, sense distinction, word formation analysis, precise reference. Disciplines: academic writing, linguistics, dictionary and usage analysis. Commonness: moderately common.