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pernicious

adjective
 
 
/pəˈnɪʃ.əs/ US  /pɚ-/ formal

Definition

having a very harmful effect or influence: The cuts in government funding have had a pernicious effect on local health services.Dangerous and harmful
(Definition of pernicious adjective from the Cambridge Advanced Learner's Dictionary & Thesaurus © Cambridge University Press)

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