- illegal⇄adj. 1. not lawful; against the law; forbidden by law.
Ex. Driving faster than the speed limit is illegal.
(SYN) unlawful, illicit.
2. not according to official regulations. - illegal⇄adv. illegally.
- illegal⇄illegal, adjective, noun.
- illegal⇄noun illegalness.
- illegal⇄noun 1. a person who acts illegally.
2. a secret agent who adopts a fictitious identity to avoid detection.