noxious

• noctious (obsolete)

From Latin noxius (“hurtful, injurious”), from noxa (“hurt, injury”), from nocere (“to hurt, injure”); see nocent.

• (Received Pronunciation) IPA^(key): /ˈnɒkʃəs/

noxious (comparative more noxious, superlative most noxious)

1. Harmful; injurious.
   • 2014 June 14, “It's a gas”, in The Economist, volume 411, number 8891:

     But out of sight is out of mind. And that […] means that many old sewers have been neglected and are in dire need of repair. If that repair does not come in time, the result is noxious and potentially hazardous.

• Nouns to which "noxious" is often applied: substance, chemical, fume, gas, odor, plant, weed, animal, stimulus, stimulation.

• harmful
• injurious
• scathel
• see also Thesaurus:harmful

• noxious in Webster’s Revised Unabridged Dictionary, G. & C. Merriam, 1913.
• noxious in The Century Dictionary, New York, N.Y.: The Century Co., 1911.
• noxious at OneLook Dictionary Search
• “noxious” in Douglas Harper, Online Etymology Dictionary, 2001–2019.