deleterious

[del-i-teer-ee-uhs]
adjective
1.
injurious to health: deleterious gases.
2.
harmful; injurious: deleterious influences.

Origin:
1635–45; < Greek dēlētḗrios destructive, adj. derivative of dēlētḗr destroyer, equivalent to dēlē- variant stem of dēleîsthai to hurt, injure + -tēr agent suffix + -ios adj. suffix; see -ious

deleteriously, adverb
deleteriousness, noun
nondeleterious, adjective
nondeleteriously, adverb
nondeleteriousness, noun
undeleterious, adjective
undeleteriously, adverb
undeleteriousness, noun


2. pernicious, hurtful, destructive; noxious.


2. beneficial.
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World English Dictionary
deleterious (ˌdɛlɪˈtɪərɪəs)
 
adj
harmful; injurious; hurtful
 
[C17: from New Latin dēlētērius, from Greek dēlētērios injurious, destructive, from dēleisthai to hurt]
 
dele'teriously
 
adv
 
dele'teriousness
 
n

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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Etymonline
Word Origin & History

deleterious
1640s, from Gk. deleterios, from deleter "destroyer," from deleisthai "to hurt, injure."
Online Etymology Dictionary, © 2010 Douglas Harper
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American Heritage
Medical Dictionary

deleterious del·e·te·ri·ous (děl'ĭ-tēr'ē-əs)
adj.
Having a harmful effect; injurious.

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
But that's not to say that they couldn't have some deleterious health effects.
In animals, individuals who have suffered deleterious changes are removed by
  the process of natural selection.
The result: The deleterious insects emerged more pestilent and plentiful than
  ever.
That would have a deleterious effect on free speech, privacy advocates say.
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