[per-nish-uh s] /pərˈnɪʃ əs/

causing insidious harm or ruin; ruinous; injurious; hurtful:
pernicious teachings; a pernicious lie.
deadly; fatal:
a pernicious disease.
Obsolete. evil; wicked.
wicked or malicious: pernicious lies
causing grave harm; deadly

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.

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


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