nauseous vs loathsome

nauseous and loathsome both are adjectives.

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

As adjectives, nauseous and loathsome are synonyms defined as:

Other synonyms of nauseous include nauseating, noisome, offensive, queasy, sickening, vile.

nauseous (adjective)	loathsome (adjective)
feeling nausea; feeling about to vomit	highly offensive; arousing aversion or disgust
causing or able to cause nausea	causing or able to cause nausea