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pernicious

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pernicious/pɚˈnɪʃəs/adjective
pernicious
/pɚˈnɪʃəs/
adjective
Learner's definition of PERNICIOUS  
[more pernicious; most pernicious]formal
: causing great harm or damage often in a way that is not easily seen or noticed

— perniciously

adverb
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