Harmful to living things; injurious to health: noxious chemical wastes. (adjective)
Harmful to the mind or morals; corrupting: noxious ideas. (adjective)
American Heritage(R) Dictionary of the English Language, Fifth Edition. Copyright (c) 2011 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.
Use "noxious" in a sentence
"The good news, indeed, coming from this location, about 30 miles northwest of the previous Long Beach location here in the city of Los Angeles, L.A. firefighters, including our hazardous materials experts, have gone into a three-story AT&T telephone company switching office where they discovered approximately 10 persons who had become ill after being exposed to what they described as noxious fumes."
"The only thing that makes me noxious is that this beautiful situation is so surreal we can only imagine it in an advert."
"I was sunk in noxious geekery with the switch to Shaw and GoDaddy, but I have not forgotten you."