pernicious

[ per-nish-uhs ]
See synonyms for pernicious on Thesaurus.com
adjective
  1. causing insidious harm or ruin; ruinous; injurious; hurtful: pernicious teachings;a pernicious lie.

  2. deadly; fatal: a pernicious disease.

  1. Obsolete. evil; wicked.

Origin of pernicious

1
First recorded in 1515–25; from Latin perniciōsus “ruinous,” from pernici(ēs) “ruin” (from per- per- + -nici-, combining form of nex “death, murder” + -ēs, noun suffix) + -ōsus -ous

Other words for pernicious

Other words from pernicious

  • per·ni·cious·ly, adverb
  • per·ni·cious·ness, noun
  • un·per·ni·cious, adjective
  • un·per·ni·cious·ly, adverb

Words Nearby pernicious

Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2024

How to use pernicious in a sentence

  • It occurs in well-marked cases of pernicious anemia and leukemia, and, much less commonly, in very severe symptomatic anemias.

    A Manual of Clinical Diagnosis | James Campbell Todd
  • In pernicious anemia they are always greatly diminished, and an increase should exclude the diagnosis of this disease.

    A Manual of Clinical Diagnosis | James Campbell Todd
  • Megaloblasts are found in pernicious anemia, and with extreme rarity in any other condition.

    A Manual of Clinical Diagnosis | James Campbell Todd
  • Pathologically, normoblasts occur in severe symptomatic anemia, leukemia, and pernicious anemia.

    A Manual of Clinical Diagnosis | James Campbell Todd
  • A few of these may be present in very marked leukocytosis or any severe blood condition, as pernicious anemia.

    A Manual of Clinical Diagnosis | James Campbell Todd

British Dictionary definitions for pernicious

pernicious

/ (pəˈnɪʃəs) /


adjective
  1. wicked or malicious: pernicious lies

  2. causing grave harm; deadly

Origin of pernicious

1
C16: from Latin perniciōsus, from perniciēs ruin, from per- (intensive) + nex death

Derived forms of pernicious

  • perniciously, adverb
  • perniciousness, noun

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