Etymology
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imperious (adj.)

1540s, "of a dominating character," from Latin imperiosus "commanding, mighty, powerful," from imperium "empire, command" (see empire). Formerly also emperious. Meaning "imperial" is from 1580s. Related: Imperiously; imperiousness.

Imperious applies to the spirit or manner of the person ruling or giving a command, and of rule in general; imperative, to the nature of a command. An imperious person is determined to have his will obeyed; imperious rule is characterized by the haughty, overbearing, and determined nature of the ruler. [Century Dictionary]

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Definitions of imperious

imperious (adj.)
having or showing arrogant superiority to and disdain of those one views as unworthy; "a more swaggering mood than usual"- W.L.Shirer;
Synonyms: disdainful / haughty / lordly / overbearing / prideful / sniffy / supercilious / swaggering
From wordnet.princeton.edu