duplicitous adj. + Add to list US //duˈpɫɪsɪtəs// UK //djuːplˈɪsɪtəs// du·plic·i·tous SynonymsEtymology Synonyms ambidextrousdeceitfuldouble dealingdouble faceddouble tonguedjanus facedtwo facedOrigin From duplicity + -ous.