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

nauseating, nauseous, noisome, queasy, sickening, vile

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

unwholesome

WordNet sense 3 (highly offensive; arousing aversion or disgust):

disgusting, distasteful, foul, repellent, revolting, wicked, yucky, disgustful, loathly, repellant, repelling, skanky, wicked

WordNet sense 4 (unpleasant or disgusting especially to the senses):

offensive