nefarious \nuh-FAIR-ee-uhs\ (adjective) - Wicked in the extreme; iniquitous.
"Stone served a summons on a nefarious character today, and another nefarious character took a swing at him. And connected." -- Stuart Woods, 'Fresh Disasters'
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Nefarious is from Latin nefarius, from nefas, "that which is contrary to divine command; a crime, transgression, sin," from ne-, "not" + fas, "divine command or law."