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pernicious
Definitions
[pəˈnɪʃəs], (Adjective)
Definitions:
- having a harmful effect, especially in a gradual or subtle way
(e.g: the pernicious effects of air pollution)
Phrases:
Origin
:
late Middle English: from Latin perniciosus ‘destructive’, from pernicies ‘ruin’, based on nex, nec- ‘death’
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definition by Oxford Dictionaries