In a manner contrary to law.

Not clear enough to be read; unreadable; not legible or decipherable.

Contrary to or forbidden by law, especially criminal law. / Breaching certain enacted statutes of positive law; not lawful, not legal (cf. immoral, unethical) / Forbidden by established rules.

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

In a manner that produces illegible results.

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

plural of illegality

plural of illegal

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

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