WordNet sense 1 (causing or able to cause nausea):

loathsome, nauseating, noisome, offensive, queasy, sickening, vile

WordNet sense 2 (detrimental to physical or moral well-being):

unwholesome

WordNet sense 3 (feeling nausea; feeling about to vomit):

nauseated, sickish

WordNet sense 4 (affected by an impairment of normal physical or mental function):

ill, sick