autocratic

adj. dictatorial, despotic, all-powerful

An autocracy is a form of government in which the political power is held by a single self appointed ruler, usually a dictator. The term autocrat is derived from the Greek word autokratôr (lit. "self-ruler", or to: "rule by one's self"). Compare with oligarchy (literally means rule by the few) and democracy (rule by the people).
See more at Wikipedia.org...

Adjective
1. of the nature of or relating to an autocrat; "an autocratic ruler"
(synonym) autocratical
(pertainym) tyrant, autocrat, despot
2. relating to or of the nature of or having characteristics of an autocracy; "an autocratic government"; "autocratic political rule"
(synonym) autocratical
(pertainym) autocracy, autarchy
3. offensively self-assured or given to exercising usually unwarranted power; "an autocratic person"; "autocratic behavior"; "a bossy way of ordering others around"; "a rather aggressive and dominating character"; "managed the employees in an aloof magisterial way"; "a swaggering peremptory manner"
(synonym) bossy, dominating, high-and-mighty, magisterial, peremptory
(similar) domineering
4. 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"
(synonym) authoritarian, dictatorial, despotic, tyrannical
(similar) undemocratic

(a.)
Alt. of Autocratical
  

autocratic
autocratically