du·plic·i·tous

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

Origin:
1960–65; duplicit(y) + -ous

du·plic·i·tous·ly, adverb
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Based on the Random House Dictionary, © Random House, Inc. 2013.
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World English Dictionary
duplicity (djuːˈplɪsɪtɪ) [Click for IPA pronunciation guide]
 
n , pl -ties
deception; double-dealing
 
[C15: from Old French duplicite, from Late Latin duplicitās a being double, from Latin duplex]
 
du'plicitous
 
adj

Collins English Dictionary - Complete & Unabridged 10th Edition
2009 © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009
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00:10
Duplicitous is always a great word to know.
So is flibbertigibbet. Does it mean:
a calculus or concretion found in the stomach or intestines of certain animals, esp. ruminants, formerly reputed to be an effective remedy for poison.
a chattering or flighty, light-headed person.
Etymonline
Word Origin & History

duplicitous
1961, from duplicity + -ous.
Online Etymology Dictionary, © 2010 Douglas Harper
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Example sentences
Otherwise their project comes off as confused, confusing and duplicitous.
In this case acting as chair is a good opportunity to practice being
  supercilious and duplicitous.
And so the duplicitous mind games continue, from strength to strength.
Authenticity is embracing the fact that we're necessarily duplicitous beings.
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