[doo-plis-i-tuhs, dyoo-]
marked or characterized by duplicity.

1960–65; duplicit(y) + -ous

duplicitously, adverb
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World English Dictionary
duplicity (djuːˈplɪsɪtɪ)
n , pl -ties
deception; double-dealing
[C15: from Old French duplicite, from Late Latin duplicitās a being double, from Latin duplex]

Collins English Dictionary - Complete & Unabridged 10th Edition
2009 © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
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Word Origin & History

1961, from duplicity + -ous.
Online Etymology Dictionary, © 2010 Douglas Harper
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Example sentences
Name calling, duplicitous plotting, coercing family and friends.
In this case acting as chair is a good opportunity to practice being
  supercilious and duplicitous.
The personalities emerge sharper, firmer and more duplicitous.
Authenticity is embracing the fact that we're necessarily duplicitous beings.
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