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pernicious 
pernicious definition
per·ni·cious (pər nis̸h′əs)
adjective
- causing great injury, destruction, or ruin; fatal; deadly
- Rare wicked; evil
Etymology: Fr pernicieux < L perniciosus < pernicies, destruction < pernecare, to kill < per, thoroughly + necare, to kill: see necro-
Related Forms:
- perniciously per·ni′·ciously adverb
- perniciousness per·ni′·cious·ness noun
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