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Adverb: perfidiously  pu(r)'fi-dee-us-lee
  1. In a perfidious manner
    "he was playing perfidiously one side against the other"

Encyclopedia: Perfidiously

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perfection
perfectionism
perfectionist
perfective
perfective aspect
perfective tense
perfectly
perfectness
perfervid
perfidious
perfidiously
perfidiousness
perfidy
perfluorocarbon
perfoliate
perfoliate leaf
perforate
perforated
perforated eardrum
perforating vein
perforation