"illicit" in the adjective sense
1. illicit
contrary to accepted morality (especially sexual morality) or convention
"an illicit association with his secretary"
2. illegitimate, illicit, outlaw, outlawed, unlawful
contrary to or forbidden by law
"an illegitimate seizure of power"
"illicit trade"
"an outlaw strike"
"unlawful measures"
Source: WordNet® (An amazing lexical database of English)
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