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pernicious

[per-nish-uh s] /pərˈnɪʃ əs/
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
1515-1525
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
Related forms
perniciously, adverb
perniciousness, noun
unpernicious, adjective
unperniciously, adverb
Synonyms
1. harmful, detrimental, deleterious, destructive, damaging, baneful, noxious, malicious. 2. lethal.
Dictionary.com Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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Examples from the web for pernicious
  • But a bias can be real, and pernicious, without being legally actionable.
  • But a more pernicious problem is the impact upon incentives of all firms.
  • In the end, he conveys the earnest message that pernicious substance abuse can be overcome with willpower and courage.
  • He resists any suggestion that his gambling addiction might be pernicious.
  • This pernicious cycle must end.
  • Some of its most pernicious influences, though, never make the headlines.
  • It packed a more pernicious punch.
  • Austin had contracted in the world a pernicious habit of swearing.
  • But it could also prove pernicious.
  • Shame on you for printing such pernicious and pandering propaganda.
British Dictionary definitions for pernicious

pernicious

/pəˈnɪʃəs/
adjective
1.
wicked or malicious: pernicious lies
2.
causing grave harm; deadly
Derived Forms
perniciously, adverb
perniciousness, noun
Word Origin
C16: from Latin perniciōsus, from perniciēs ruin, from per- (intensive) + nex death
Collins English Dictionary - Complete & Unabridged 2012 Digital Edition
© William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012
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Word Origin and History for pernicious
adj.

early 15c., from Middle French pernicios (13c., Modern French pernicieux) and directly from Latin perniciosus "destructive," from pernicies "destruction, death, ruin," from per- "completely" (see per) + necis "violent death, murder," related to necare "to kill," nocere "to hurt, injure, harm," noxa "harm, injury" (see noxious). Related: Perniciously; perniciousness.

Online Etymology Dictionary, © 2010 Douglas Harper
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pernicious in Medicine

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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