(obsolete) An illegal act or technique. / (colloquial, in the plural, as illegals) Contraband, esp. illegal substances such as drugs. / (colloquial, offensive) An illegal immigrant.

(law) the state of being illegal / (law, uncountable) a defense to the validity of a contract because it was in violation of the law

In a manner that produces illegible results.

In a manner contrary to law.

plural of illegality

illegibility

The characteristic or quality of being illegible; the quality of being difficult or impossible to read.

plural of illegalization

To make illegal; to prohibit by law, to criminalize.

not allowed by the laws or rules