1. 
[syn: authoritarian, autocratic, dictatorial, despotic, tyrannic, tyrannical]
The Collaborative International Dictionary of English v.0.48:
Tyrannic \Ty*ran"nic\ (?; 277), Tyrannical \Ty*ran"nic*al\, a.
   [L. tyrannicus, Gr. ?: cf. F. tyrannique. See Tyrant.]
   Of or pertaining to a tyrant; suiting a tyrant; unjustly
   severe in government; absolute; imperious; despotic; cruel;
   arbitrary; as, a tyrannical prince; a tyrannical master;
   tyrannical government. "A power tyrannical." --Shak.
   [1913 Webster]
         Our sects a more tyrannic power assume.  --Roscommon.
   [1913 Webster]
         The oppressor ruled tyrannic where he durst. --Pope.
   [1913 Webster] -- Ty*ran"nic*al*ly, adv. --
   Ty*ran"nic*al*ness, .
   [1913 Webster]
WordNet (r) 3.0 (2006):
tyrannic
    adj 1: 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]