illicit
in- ‘not’ + licitus (see licit)
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adjective
forbidden by law, rules, or custom:
〈薬･取引などが〉違法の, 不法の; 禁制の; (道徳的に)許されない
e.g. illicit drugs
e.g. illicit sex.
DERIVATIVES
illicitly |i(l)ˈlisitlē| adverb
illicitness noun
ORIGIN
early 16th century: from French, or from Latin illicitus, from in- ‘not’ + licitus (see licit).