Synonyms:
nefarious, villainous
Meaning: extremely wicked; "nefarious schemes"; "a villainous plot"; "a villainous band of thieves"
Usage examples
And he to me: "That is the ancient ghost Of the nefarious Myrrha, who became Beyond all rightful love her father's lover.
But Cissy had insisted, and he had put her and the picture into a little room off the main gallery, where she could pursue her nefarious work unperceived.
He thought suddenly of the noble burglar who had turned his back upon the mysterious, nefarious tools of his trade and now dispensed margarine to his former victims.
So there was an upright man, possibly a very Hugo in character, who was thwarting and defying the evildoer in his nefarious career, and there was a dastardly plot afoot to break his neck!