nauseous vs nauseated

nauseous and nauseated both are adjectives.

Word	Noun	Adjective	Verb	Adverb
nauseous	No	Yes	No	No
nauseated	No	Yes	No	No

As adjectives, nauseous and nauseated are synonyms defined as:

Other synonyms of nauseous include queasy, sick, sickish.

nauseous (adjective)	nauseated (adjective)
feeling nausea; feeling about to vomit	feeling nausea; feeling about to vomit
causing or able to cause nausea