Source : Webster's Revised Unabridged Dictionary (1913)

Culpable \Cul"pa*ble\ (k?l"p?-b'l), a. [OE. culpable, coulpable,
   coupable, F. coupable, formerly also coupable, formerly also
   coulpable, culpable, fr. L. culpabilis, fr. culpare to blame,
   fr. culpa fault.]
   1. Deserving censure; worthy of blame; faulty; immoral;
      criminal. --State Trials (1413).

            If he acts according to the best reason he hath, he
            is not culpable, though he be mistaken in his
            measures.                             --Sharp.

   2. Guilty; as, culpable of a crime. [Obs.] --Spenser. --
      {Cul"pa*ble*ness}, n. -- {Cul"pa*bly}, adv.

Source : WordNet®

culpably
     adv : in a manner or to a degree deserving blame or censure [syn:
           {reprehensibly}]