extramarital vs adulterous

extramarital and adulterous both are adjectives.

Word	Noun	Adjective	Verb	Adverb
extramarital	No	Yes	No	No
adulterous	No	Yes	No	No

As adjectives, extramarital and adulterous are synonyms defined as:

Other synonyms of extramarital include extracurricular.

extramarital (adjective)	adulterous (adjective)
characterized by adultery	characterized by adultery
	not faithful to a spouse or lover