The essence of a person that is being deceptive, or the act of being deceptive. AKA trying to pull the wool over someones eyes.
Mom says, "Did you do your homework?"
Son says, "Yes Mom."

(When in fact he did not...)
Mom says, "Son- stop being deceptious."
by soymilkmuse October 11, 2010
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Darth Deceptious is the absolute ruler of the Sith Empire. He is said to be immortal, wise, and all-powerful, standing above all the Sith Lords, even the Dark Council. He is the supreme master over the Dark Side of the Force and rules with an iron fist. Deceptious is cruel, ruthless, and cunning and makes examples of those who would dare oppose his supreme rule or attempt to remove him from the Imperial Throne. Deceptious is the one true Sith, a master of masters.
"Imperial Moff: I just had a government meeting with Darth Deceptious. He is as fearsome and frightening as they all say.
Imperial Officer: Yes, he really is. When I first met him, I thought it would have been the end of me."

"Did you know Darth Deceptious is the ruler of Sith? It's shocking to know he overthrew the last Emperor from power."
by Darth Deceptious July 13, 2019
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An extremely, underhanded, deceitful action, thought, idea, belief, value etc.
Deceptious in his thinking as he sought to hide the papers he had recently removed from his fathers briefcase.
by Ned Phillips June 1, 2011
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