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Pernicious Highly Injurious Destructive Insidious Pestilent Pertaining Noxious

Front pernicious
Back highly injurious; destructive; insidious; pestilent

PER (PERtaining to) + noxious (NICIOUS) -> something harmful
PERtaining to vICIOUS
PERish
PERNICIOUS anemia (often B12 deficiency)
PERring (purring) cats slink around, insidious like pernicious

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