The Collaborative International Dictionary of English v.0.48:
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.] [1913 Webster]