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WordReference Random House Learner's Dictionary of American English © 2024per•ni•cious /pɚˈnɪʃəs/USA pronunciation adj. - causing harm or ruin;
evil in effect;
ruinous:a pernicious lie.
per•ni•cious•ly, adv. per•ni•cious•ness, n. [uncountable] WordReference Random House Unabridged Dictionary of American English © 2024per•ni•cious (pər nish′əs),USA pronunciation adj. - causing insidious harm or ruin;
ruinous;
injurious;
hurtful:pernicious teachings; a pernicious lie. - Pathologydeadly;
fatal:a pernicious disease. - [Obs.]evil;
wicked.
- Latin perniciōsus ruinous, equivalent. to pernici(ēs) ruin (per- per- + -nici-, combining form of nex death, murder (stem nec-) + -iēs noun, nominal suffix) + -ōsus -ous
- 1515–25
- 1.See corresponding entry in Unabridged harmful, detrimental, deleterious, destructive, damaging, baneful, noxious, malicious.
- 2.See corresponding entry in Unabridged lethal.
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