duplicitous
dup·li·ci·tous
adjective
1.
marked by deliberate deceptiveness especially by pretending one set of feelings and acting under the influence of another
- “she was a deceitful scheming little thing” Israel Zangwill
- “a double-dealing double agent”
- “a double-faced infernal traitor and schemer” W.M.Thackeray
Origin
From duplicity + -ous.
WordNet 2.1 (Princeton University). Wiktionary (CC BY-SA). CMU Pronouncing Dictionary. WordNet 2.1 Copyright Princeton University. All rights reserved. Wiktionary content is available under the Creative Commons Attribution-ShareAlike Licence.