noun
1. a person who behaves in a tyrannical manner
e.g. my boss is a dictator who makes everyone work overtime
Synonym: dictator
authoritarian
adj
1. characteristic of an absolute ruler or absolute rule
having absolute sovereignty
e.g. an authoritarian regime
autocratic government
despotic rulers
a dictatorial rule that lasted for the duration of the war
a tyrannical government
Synonym: autocraticdictatorialdespotictyrannictyrannical
2. expecting unquestioning obedience
e.g. the timid child of authoritarian parents
insufferably overbearing behavior toward the waiter
Synonym: dictatorialoverbearing