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The Collaborative International Dictionary
Criminously

Criminous \Crim"i*nous\ (kr?m"?-n?s), a. [L. criminosus, fr. crimen. See Crime.] Criminal; involving great crime or grave charges; very wicked; heinous. [Obs.]
--Holland. -- Crim"i*nous*ly, adv. -- Crim"i*nous*ness, n. [Obs.]

Wiktionary
criminously

adv. In a criminous manner.