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Synonyms for noxious

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Harmful
baneful, pernicious, deleterious; see harmful, pernicious.
Foul
noisome, foul, putrid; see offensive 2, rotten 1.
Poisonous
toxic, virulent, venomous; see deadly, harmful, poisonous. See syn. study at pernicious.

See noxious in Webster's New World Roget's A-Z Thesaurus II

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