Illegal \Il*le"gal\, a. [Pref. il- not + legal: cf. F. ill['e]gal.]

Not according to, or authorized by, law; specif., contrary to, or in violation of, human law; unlawful; illicit; hence, immoral; as, an illegal act; illegal trade; illegal love. --Bp. Burnet.

Source: Webster's Revised Unabridged Dictionary (1913)