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From The Collaborative International Dictionary of English v.0.48:
Noxious \Nox"ious\, a. [L. noxius, fr. noxa harm; akin to nocere to harm, hurt. Cf. Nuisance, Necromancy.] [1913 Webster] 1. Hurtful; harmful; baneful; pernicious; injurious; destructive; unwholesome; insalubrious; as, noxious air, food, or climate; pernicious; corrupting to morals; as, noxious practices or examples. [1913 Webster] Too frequent an appearance in places of public resort is noxious to spiritual promotions. --Swift. [1913 Webster] 2. Guilty; criminal. [R.] [1913 Webster] Those who are noxious in the eye of the law. --Abp. Bramhall. [1913 Webster] Syn: Noisome; hurtful; harmful; injurious; destructive; pernicious; mischievous; corrupting; baneful; unwholesome; insalubrious. See Noisome. [1913 Webster] -- Nox"ious*ly, adv. -- Nox"ious*ness, n. [1913 Webster]