a. [ Pref. il- not + legal: cf. F. illégal. ] Not according to, or authorized by, law; specif., contrary to, or in violation of, human law; unlawful; illicit; hence, immoral;
n.;
v. t.
adv. In a illegal manner; unlawfully. [ 1913 Webster ]
n. Illegality, unlawfulness. [ 1913 Webster ]