- Causing death or injury; deadly.
- Causing much harm in a subtle way.
Etymology: From , from pernicios, from perniciosus, from pernicies, "destruction".
- 1911, w:Emma Goldman, Emma Goldman, s:Anarchism and Other Essays/7, The Hypocrisy of Puritanism,
- : Puritanism no longer employs the thumbscrew and lash; but it still has a most hold on the minds and feelings of the American people.
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Full Definition of pernicious