Source : Webster's Revised Unabridged Dictionary (1913)

Facinorous \Fa*cin"o*rous\, a. [L. facinorous, from facinus
   deed, bad deed, from facere to make, do.]
   Atrociously wicked. [Obs.] --Jer. Taylor. --
   {Fa*cin"o*rous*ness}, n. [Obs.]