Use 'illicit' to describe actions or items banned by laws, like smuggling or unapproved medications. She was caught selling illicit copies of movies online.
Pro Tip 2/3
Media Reporting
Journalists often use 'illicit' when reporting on illegal trade or criminal activities. Police busted an illicit weapons ring in the city.
Pro Tip 3/3
Overtone of Secrecy
'Illicit' carries a sense of secrecy; it's used for things done in hidden or sneaky ways. The corporation was fined for its illicit dumping of toxic waste.