Source : Webster's Revised Unabridged Dictionary (1913)

Despotic \Des*pot"ic\, Despotical \Des*pot"ic*al\, a. [Gr. ?:
   cf. F. despotique.]
   Having the character of, or pertaining to, a despot; absolute
   in power; possessing and abusing unlimited power; evincing
   despotism; tyrannical; arbitrary. -- {Des*pot"ic*al*ly}, adv.
   -- {Des*pot"ic*al*ness}, n.

Source : WordNet®

despotical
     adj : belonging to or having the characteristics of a despot [syn:
            {despotic}]