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Adverb: perniciously  pu(r)'ni-shus-lee
  1. In a harmfully insidious manner
    "these drugs act perniciously";
    - insidiously
     
  2. In a noxiously baneful way
    "this perniciously poisoned climate";
    - banefully

Encyclopedia: Perniciously

Nearest

permutability
permutable
permutableness
permutation
permute
Pernambuco
pernambuco wood
pernicious
pernicious anaemia
pernicious anemia
perniciously
perniciousness
pernickety
pernio
Pernis
Pernis apivorus
pernoctate
Pernod
pernyi moth
Perodicticus
Perodicticus potto