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Adjective: noxious  nókshus
  1. Injurious to physical or mental health
    "noxious chemical wastes"; "noxious ideas"

See also: baneful, corrupting, deadly, degrading, harmful, noxiously, noxiousness, pernicious, pestilent, toxic, unwholesome, vesicant, vesicatory

Antonym: innocuous

Encyclopedia: Noxious