perniciously

pernicious

[per-nish-uhs]
adjective
1.
causing insidious harm or ruin; ruinous; injurious; hurtful: pernicious teachings; a pernicious lie.
2.
deadly; fatal: a pernicious disease.
3.
Obsolete. evil; wicked.

Origin:
1515–25; < Latin perniciōsus ruinous, equivalent to pernici(ēs) ruin (per- per- + -nici-, combining form of nex death, murder (stem nec-) + -iēs noun suffix) + -ōsus -ous

perniciously, adverb
perniciousness, noun
unpernicious, adjective
unperniciously, adverb


1. harmful, detrimental, deleterious, destructive, damaging, baneful, noxious, malicious. 2. lethal.
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Based on the Random House Dictionary, © Random House, Inc. 2014.
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Collins
World English Dictionary
pernicious (pəˈnɪʃəs)
 
adj
1.  wicked or malicious: pernicious lies
2.  causing grave harm; deadly
 
[C16: from Latin perniciōsus, from perniciēs ruin, from per- (intensive) + nex death]
 
per'niciously
 
adv
 
per'niciousness
 
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

pernicious
1521, from M.Fr. pernicios (13c., Fr. pernicieux), from L. perniciosus "destructive," from pernicies "destruction, death, ruin," from per- "completely" + necis "violent death, murder," related to necare "to kill," nocere "to hurt, injure, harm," noxa "harm, injury" (see noxious).
Online Etymology Dictionary, © 2010 Douglas Harper
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American Heritage
Medical Dictionary

pernicious per·ni·cious (pər-nĭsh'əs)
adj.
Tending to cause death or serious injury; deadly.

The American Heritage® Stedman's Medical Dictionary
Copyright © 2002, 2001, 1995 by Houghton Mifflin Company. Published by Houghton Mifflin Company.
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