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.

The quality of being illegal.

In a manner contrary to law.

(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 illegal

plural of illegality

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

The act or process of illegalizing.

simple past tense and past participle of illegalize