Il·lic·it a. Not permitted or allowed; prohibited; unlawful; as, illicit trade; illicit intercourse; illicit pleasure.
One illicit . . . transaction always leads to another. --Burke.
-- Il*lic*it*ly, adv. -- Il*lic*it*ness, n.
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illicitness
n : the quality of not conforming strictly to law [ant: licitness]