Illicit (adjective) — محظور وممنوع: Forbidden by law, rules or custom. Below are 8 words with a similar meaning; the linked ones have full GL Dictionary entries with their meaning in Arabic.
An unofficial illegal trade outside lawful stalls; also any side channel that sells what should only be licensed, measured, and logged
Secret or hidden, especially for illicit or unauthorized purposes; kept concealed from public knowledge; covert operations conducted in secrecy
illegalunlawfulbannedprohibitedforbiddencriminal
Without official permission. British also unauthorised.