double-tongued vs deceitful

double-tongued and deceitful both are adjectives.

Word	Noun	Adjective	Verb	Adverb
double-tongued	No	Yes	No	No
deceitful	No	Yes	No	No

As adjectives, double-tongued and deceitful are synonyms defined as:

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

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

double-tongued (adjective)	deceitful (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