noxious

[nok-shuhs]
adjective
1.
harmful or injurious to health or physical well-being: noxious fumes.
2.
morally harmful; corrupting; pernicious: a noxious plan to spread dissension.

Origin:
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.
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World English Dictionary
noxious (ˈnɒkʃəs)
 
adj
1.  poisonous or harmful
2.  harmful to the mind or morals; corrupting
 
[C17: from Latin noxius harmful, from noxa injury]
 
'noxiously
 
adv
 
'noxiousness
 
n

Collins English Dictionary - Complete & Unabridged 10th Edition
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Etymonline
Word Origin & History

noxious
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)
adj.
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
  battle.
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