[syn: authoritarian, autocratic, dictatorial, despotic, tyrannic, tyrannical]
The Collaborative International Dictionary of English v.0.48:
Despotic \Des*pot"ic\, Despotical \Des*pot"ic*al\, a. [Gr.
   despotiko`s: 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.
   [1913 Webster]
WordNet (r) 3.0 (2006):
despotic
    adj 1: belonging to or having the characteristics of a despot
           [syn: despotic, despotical]
    2: ruled by or characteristic of a despot; "moved from a feudal
       to a despotic order"; "his administration was arrogant and
       despotic"
    3: characteristic of an absolute ruler or absolute rule; having
       absolute sovereignty; "an authoritarian regime"; "autocratic
       government"; "despotic rulers"; "a dictatorial rule that
       lasted for the duration of the war"; "a tyrannical
       government" [syn: authoritarian, autocratic,
       dictatorial, despotic, tyrannic, tyrannical]
Moby Thesaurus II by Grady Ward, 1.0:
65 Moby Thesaurus words for "despotic":
   absolute, absolutist, absolutistic, arbitrary, aristocratic,
   arrogant, autarchic, authoritarian, authoritative, autocratic,
   autonomous, bossy, bureaucratic, civic, civil, constitutional,
   democratic, dictatorial, domineering, fascist, federal, federalist,
   federalistic, feudal, governmental, grinding, gubernatorial,
   heteronomous, high-handed, imperative, imperial, imperious, lordly,
   magisterial, magistral, masterful, matriarchal, matriarchic,
   monarchal, monarchial, monarchic, monocratic, official, oligarchal,
   oligarchic, oppressive, overbearing, overruling, parliamentarian,
   parliamentary, patriarchal, patriarchic, peremptory, pluralistic,
   political, repressive, republican, self-governing, severe, strict,
   suppressive, theocratic, totalitarian, tyrannical, tyrannous