Illicit
Nefarious
Nefarious adjective - Not conforming to a high moral standard; morally unacceptable.
Mutual synonyms
Cite this Source
Nefarious and Illicit. (2016). Retrieved 2026, July 22, from https://thesaurus.plus/related/illicit/nefarious
Illicit & Nefarious. N.p., 2016. Web. 22 Jul. 2026. <https://thesaurus.plus/related/illicit/nefarious>.
Nefarious or Illicit. 2016. Accessed July 22, 2026. https://thesaurus.plus/related/illicit/nefarious.
Google Ngram Viewer shows how "illicit" and "nefarious" have occurred on timeline