The combination of the words "devious" and "deceitful”; an extremely cunning and underhanded individual.
“She’s so deceivious---her husband and her boyfriend are both at this party, and neither has a clue about the other!”
by Bluesky January 14, 2006
Misleading or obscuring the truth by means of cunning concealment
He being the last and most important decoy, the magician's deceivious plan to burglarize the family's house under the guise of a simple children's magic birthday party was finally underway.
by Rysword August 14, 2007