What does duplicitous mean?
Duplicitous is an adjective used to describe people, statements, or behavior that are deliberately and systematically deceptive. A duplicitous person presents one face to some audiences and another to others, concealing their true intentions behind a mask of honesty or loyalty. The word carries a strong negative charge: it does not describe innocent misunderstanding or ambiguity, but conscious, calculated deceit, often sustained over time. It appears most often in formal writing and journalism, particularly in discussions of politics, diplomacy, business dealings, and personal betrayal — phrases such as 'duplicitous behavior' and 'duplicitous dealings' are well established. The word derives ultimately from Latin duplex, meaning 'twofold' or 'double', the same root that gives us duplicate and duplicity, so its core image is of a divided or doubled character. Knowing this word allows a speaker to condemn deceit precisely, distinguishing it from vaguer terms like 'dishonest' by emphasizing the element of pretense and contradiction.
adjectiveDeliberately deceitful in speech or behavior, saying or doing different things to different people in order to mislead. It describes a person or conduct marked by two-faced dishonesty rather than mere error.
- Characterized by deliberate deception; behaving in a way that is deceitful and two-faced.
"The duplicitous negotiator signed the peace accord while secretly arming the rebels."
"He was exposed as duplicitous when his private letters contradicted his public promises."
"The film portrays a duplicitous agent playing both sides of the intelligence war."
Duplicitous comes from Latin duplex — 'double' — so calling someone duplicitous literally brands them as living a double life.
Reviewed by Deb Chak, Editor. AI-assisted content curated by RJS Tech Solutions LLP.
Etymology of duplicitous
Duplicitous derives from the noun duplicity, formed from Late Latin duplicitas ('doubleness'), itself built on Latin duplex ('twofold, double') — a compound of duo ('two') and -plex ('fold'). Duplicity originally meant doubleness or twofold nature before narrowing in English, by around the 16th–17th century, to mean deliberate deceitfulness; the adjective duplicitous was formed later from this noun. It shares its Latin root with cognates such as duplex, duplicate, and duplication.
Related word forms
How duplicitous is actually used
Formal to semi-formal register; common in journalism, political commentary, and literary criticism. Strongly negative connotation, implying intentional deceit rather than carelessness. Used of people, their actions, statements, or institutions.
Easily confused with duplicitous
'Duplicity' is the noun meaning deliberate deceitfulness, while 'duplicitous' is the adjective describing someone who exhibits it.
'Ambiguous' means open to more than one interpretation without intent to deceive, whereas 'duplicitous' implies deliberate deception.