What does duplicitously mean?
"Duplicitously" is an adverb describing action carried out with duplicity — that is, deliberate deception in which a person presents one face publicly while behaving quite differently behind the scenes. Someone who acts duplicitously is not merely mistaken or inconsistent; they are understood to be intentionally misleading others about their true intentions, loyalties, or conduct. The word derives from the Latin "duplex", meaning "twofold", capturing the image of a person who is double-faced. It is most at home in formal and semi-formal contexts such as political reporting, business commentary, and ethical criticism, where writers need a precise term for calculated double-dealing. Because its connotation is strongly negative and accusatory, it carries real weight: to say someone behaved duplicitously is a serious charge of sustained dishonesty rather than an offhand complaint. Related forms include the noun "duplicity" and the adjective "duplicitous".
adverbIn a manner involving deliberate deception or double-dealing; by presenting oneself falsely as honest while acting dishonestly.
- In a deliberately deceptive manner; with duplicity — concealing one's true intentions while appearing honest.
"The negotiators acted duplicitously, promising reform in public while sabotaging it behind closed doors."
"He behaved duplicitously toward his business partners, assuring them of his loyalty even as he sold their shares."
"Critics accused the government of acting duplicitously, publicly endorsing peace talks while quietly arming one side."
It comes from Latin 'duplex' — 'twofold' — because a duplicitous person literally has two faces: the one they show you, and the one they don't.
Reviewed by Deb Chak, Editor. AI-assisted content curated by RJS Tech Solutions LLP.
Etymology of duplicitously
Duplicitously is built from the adjective "duplicitous" plus the adverbial suffix "-ly". "Duplicitous" itself was formed from "duplicity", which entered English in the early 15th century via Middle French from the Late Latin "duplicitas" (double-mindedness, doubleness), derived from Latin "duplex" meaning twofold or double. The root "duplex" combines "duo" (two) with the suffix "-plex" (folded), making "duplicate", "duplicable", and "duplex" close cognates within English. While "duplicity" originally meant simple doubleness, it shifted over time to mean deliberate deception, and the adjective and adverb inherited that sense.
Related word forms
How duplicitously is actually used
Formal to neutral register; common in journalism, political commentary, and legal or ethical criticism. Strongly negative in connotation — using it asserts intentional deceit rather than mere inconsistency or ambiguity. More emphatic than simply 'dishonestly', as it implies sustained two-faced conduct rather than a single lie.
Easily confused with duplicitously
'Duplicately' is a rare adverb meaning 'in duplicate' or 'in a doubled fashion', whereas 'duplicitously' means 'with deliberate deceit'.
'Ambiguously' describes something open to more than one interpretation, without implying deliberate deception, which is central to 'duplicitously'.