deceitful vs fallacious

deceitful and fallacious both are adjectives.

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

As adjectives, deceitful and fallacious are synonyms defined as:

Other synonyms of deceitful include fraudulent.

deceitful (adjective)	fallacious (adjective)
marked by deliberate deceptiveness especially by pretending one set of feelings and acting under the influence of another	involving deception
involving deception	based on an incorrect or misleading notion or information
	containing or based on a fallacy