harmful or injurious to health or physical well-being: noxious fumes.
morally harmful; corrupting; pernicious: a noxious plan to spread dissension.

1605–15; < Latin noxius harmful, hurtful, injurious, equivalent to nox(a) harm, hurt, injury (akin to nocēre to do harm, inflict injury; see innocent) + -ius -ious

noxiously, adverb
noxiousness, noun

1. hurtful, unwholesome, unhealthy, nocuous, detrimental, deleterious. 2. corruptive.

1, 2. harmless. Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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World English Dictionary
noxious (ˈnɒkʃəs)
1.  poisonous or harmful
2.  harmful to the mind or morals; corrupting
[C17: from Latin noxius harmful, from noxa injury]

Collins English Dictionary - Complete & Unabridged 10th Edition
2009 © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009
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Word Origin & History

1612, from L. 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
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American Heritage
Medical Dictionary

noxious nox·ious (nŏk'shəs)
Harmful to living things; injurious to health.

nox'ious·ness n.
The American Heritage® Stedman's Medical Dictionary
Copyright © 2002, 2001, 1995 by Houghton Mifflin Company. Published by Houghton Mifflin Company.
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Example sentences
These chemicals can make plants smell good or, alternately, noxious.
She got him to eat his peas, whenever the noxious legume appeared on his plate,
  by paying him $5.
The noxious gas was the result of the impact.
The invaders meet any foe aggressively, releasing noxious chemicals during
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