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.
/pəˈnɪʃəs/
adjective
1.
wicked or malicious: pernicious lies
2.
causing grave harm; deadly
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.

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

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