Nefarious
Nefarious adjective - Not conforming to a high moral standard; morally unacceptable.
Usage example: the chaste heroines and nefarious villains of old-time melodramas
Sinful
Sinful adjective - Not conforming to a high moral standard; morally unacceptable.
Usage example: chastised by his minister for his sinful behavior
Nefarious is a synonym for sinful in immoral topic. You can use "Nefarious" instead an adjective "Sinful", if it concerns topics such as illegal. popular alternative
Mutual synonyms
Cite this Source
Sinful and Nefarious. (2016). Retrieved 2026, August 16, from https://thesaurus.plus/related/nefarious/sinful
Nefarious & Sinful. N.p., 2016. Web. 16 Aug. 2026. <https://thesaurus.plus/related/nefarious/sinful>.
Sinful or Nefarious. 2016. Accessed August 16, 2026. https://thesaurus.plus/related/nefarious/sinful.
Google Ngram Viewer shows how "nefarious" and "sinful" have occurred on timeline