harmful or injurious to health or physical well-being: noxious fumes.
morally harmful; corrupting; pernicious: a noxious plan to spread dissension.
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Origin of noxious
SYNONYMS FOR noxious
ANTONYMS FOR noxious
1, 2. harmless.
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2019
poisonous or harmful
harmful to the mind or morals; corrupting
Word Origin for noxious
C17: from Latin noxius harmful, from noxa injury
Collins English Dictionary - Complete & Unabridged 2012 Digital Edition © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012
c.1500, from Latin noxius "hurtful, injurious," from noxa "injury, hurt, damage entailing liability" (related to nocere "to hurt," and to nex "slaughter"), from PIE *nek-ro-, causative form of root *nek- "death" (see necro-).
Online Etymology Dictionary, © 2010 Douglas Harper
Harmful to living things; injurious to health.
The American Heritage® Stedman's Medical Dictionary Copyright © 2002, 2001, 1995 by Houghton Mifflin Company. Published by Houghton Mifflin Company.