Sinful, villainous, criminal, or wicked, especially when noteworthy or notorious for such characteristics.
Aliens have a nefarious connotation in many science fiction books.
From Latin nefārius (“execrable, abominable”), from nefās (“something contrary to divine law, an impious deed, sin, crime”), from ne- (“not”) + fās (“the dictates of religion, divine law”), which is r...
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