Mephitic

"I could have borne the sight of his crutch," said she, "but the crutch and the nephew together really oppress me like a mephitic vapour."

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It is impossible to convey, in words, any idea of the hideous phantasmagoria of shifting limbs and faces which moved through the evil-smelling twilight of this terrible prison-house. Callot might have drawn it, Dante might have suggested it, but a minute attempt to describe its horrors would but disgust. There are depths in humanity which one cannot explore, as there are mephitic caverns into which one dare not penetrate.

Source: wiktionary

From this crawling flapping mass of obscene reptilian life came the shocking clamor which filled the air and the mephitic, horrible, musty odor which turned us sick.

Source: wiktionary

More than that, perhaps the worst thing, was a sort of mephitic fog, moistureless and invisible, that came and went like an exhalation of the arid earth itself.

Source: wiktionary