undeleterious

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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Based on the Random House Dictionary, © Random House, Inc. 2014.
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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
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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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