名詞 duplicity:

1. a fraudulent or duplicitous representation
   同義詞：fraudulence
2. acting in bad faith; deception by pretending to entertain one set of intentions while acting under the influence of another
   同義詞：double-dealing

du.plic.i.ty

n.（名詞）
【復(fù)數(shù)】 du.plic.i.ties

Deliberate deceptiveness in behavior or speech.
口是心非：在行為或語言上有意的欺騙
An instance of deliberate deceptiveness; double-dealing.
有意欺騙的實例；兩面派
The quality or state of being twofold or double.
兩重性：具有兩方面的性質(zhì)或狀態(tài)

來源：
Middle English duplicite
中古英語 duplicite
from Old French
源自 古法語
from Late Latin duplicit3s [doubleness]
源自 后期拉丁語 duplicit3s [兩重性]
from Latin duplex duplic- [twofold] * see dwo-
源自 拉丁語 duplex duplic- [二重的] *參見 dwo-