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[ UK /pɜːnˈɪʃəs/ ]
[ US /pɝˈnɪʃəs/ ]
ADJECTIVE
  1. working or spreading in a hidden and usually injurious way
    glaucoma is an insidious disease
    a subtle poison
  2. exceedingly harmful

How To Use pernicious In A Sentence

  • An Ohio appellate court last week reversed a lower court ruling that the city's pernicious treatment of marijuana users was unconstitutional under state law.
  • The pernicious effect of this advertising on children is a problem that we ignore at our peril.
  • The casuistical subtilties may not be greater than the snbtilties of lawyers, hinted at above; but as the former are pernicious, and the latter innocent and even necessary, this is the reason of the very different reception they meet with from the world. An Enquiry into the Principles of Morals
  • In the case of marriage, calling SSM discriminatory or segregationist represents either a failure to adequately recognise the sexuality of the individual involved or more perniciously to regard that distinction as immaterial or undeserving of respect. Why are only queer rights on the chopping block?
  • This is a pernicious myth, no less wrong for being well meant. Times, Sunday Times
  • That relationship is what makes great art so powerful and art forgery so pernicious. Times, Sunday Times
  • Such a state of affairs could explain the responses in pernicious anemia obtained by feeding large amounts of autolyzed yeast-extract, as shown, for example, by Ungley. George R. Minot - Nobel Lecture
  • Just putting some healthier options on the menu doesn't counteract the more pernicious effect a large global corporation has.
  • How else to explain the chronic neglect of a program that effectively fights some of our most pernicious and recalcitrant social problems?
  • The first was entitled: "_Refutatio Samaritani Interim_, in quo vera religio cum sectis et corruptelis scelerate et perniciose confunditur -- Refutation of the Samaritan Interim, in which the true religion is criminally and perniciously confounded with the sects. Historical Introductions to the Symbolical Books of the Evangelical Lutheran Church
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