deceitful vs duplicitous

deceitful and duplicitous both are adjectives.

Word	Noun	Adjective	Verb	Adverb
deceitful	No	Yes	No	No
duplicitous	No	Yes	No	No

As adjectives, deceitful and duplicitous are synonyms defined as:

deceitful and duplicitous: marked by deliberate deceptiveness especially by pretending one set of feelings and acting under the influence of another

Other synonyms of deceitful include ambidextrous, double-dealing, double-faced, double-tongued, Janus-faced, two-faced.

deceitful (adjective)	duplicitous (adjective)
marked by deliberate deceptiveness especially by pretending one set of feelings and acting under the influence of another	marked by deliberate deceptiveness especially by pretending one set of feelings and acting under the influence of another
involving deception