Adjectives

(s)nauseating, nauseous, noisome, queasy, loathsome, offensive, sickening, vilecausing or able to cause nausea“a nauseating smell”, “nauseous offal”, “a sickening stench”
(s)fetid, foetid, foul, foul-smelling, funky, noisome, smelly, stinking, ill-scentedoffensively malodorous“a foul odor”, “the kitchen smelled really funky”