adjective [neh-fair-ee-us]

FULL DEFINITION

-flagrantly wicked or impious

SYNONYMS: black, dark, evil, immoral, iniquitous, bad, rotten, sinful, unethical, unlawful, unrighteous, unsavory, vicious, vile, villainous, wicked, wrong

ANTONYMS: decent, ethical, good, honest, honorable, just, moral, right, righteous, sublime, upright, virtuous

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Examples:

-"Moreover, those starry-eyed states inclined to perceive international relations in moral terms frequently underestimate the nefarious machinations of their competitors on the world political stage." —Richard Wolin, New Republic, 4 June 2001

-A nefarious scheme to exploit their rival's reputation.