duplicitous

comparative more duplicitous · superlative most duplicitous

1. Given to or marked by deliberate deceptiveness in behavior or speech.

   “(chuckles) That duplicitous genius. She's betraying me! She's probably already on Plymeria, subjugating its feeble populace. -Quick, to the shuttle.”

   2023 October 12, Edgar Momplaisir, “A Few Badgeys More” (14:06 from the start), in Star Trek: Lower Decks, season 4, episode 7, spoken by AGIMUS (Jeffrey Combs)

   2 more examples

   It reunites the horribly duplicitous skag-addicted non-heroes of the first movie about twentysomethings trying to get off heroin in Edinburgh, and finding that they have nothing very much to put in its place.

   2017 January 19, Peter Bradshaw, “T2 Trainspotting review – choose a sequel that doesn't disappoint”, in The Guardian

   Russia played on those feelings by attacking the French president, Emmanuel Macron[…], saying Moscow still remembered the fate of Napoleon Bonaparte and accusing the French president of duplicitous diplomacy with the Kremlin.

   2023 February 19, Patrick Wintour, “Ukraine war ‘over’ unless EU boosts military support, says top diplomat”, in The Guardian, →ISSN

   Synonyms: deceitful, double-dealing, double-faced, two-faced, Janus-faced · Antonyms: unduplicitous