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Adjective: loathsome  lowdh-sum
  1. Causing or able to cause nausea
    "a loathsome smell";
    - nauseating, nauseous, noisome, queasy, offensive, sickening, vile, vomitous [US], loathful [archaic]
  2. Highly offensive; arousing aversion or disgust
    "a loathsome disease";
    - disgusting, disgustful [archaic], distasteful, foul, loathly, repellent, repellant, repelling, revolting, skanky, wicked, yucky, loathful [archaic], yukky

See also: gut-wrenching, offensive, unwholesome

Encyclopedia: Loathsome