illicit

Illicit means not allowed by law or custom. It's illegal to kill endangered elephants, but many poachers still engage in the Illicit ivory trade.

Illicit usually refers to something that is not morally proper or acceptable, such as an illicit love affair. Illicit is from Latin illicitus, from the prefix in- "not" plus licitus "lawful."

Definitions of illicit
1

adj contrary to accepted morality (especially sexual morality) or convention

“an illicit association with his secretary”
Synonyms:
adulterous, extracurricular, extramarital
characterized by adultery
unlawful
not morally right or permissible
Antonyms:
licit
sanctioned by custom or morality especially sexual morality

adj contrary to or forbidden by law

illicit trade”
Synonyms:
illegitimate, outlaw, outlawed, unlawful
illegal
prohibited by law or by official or accepted rules

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