pernicious - WordReference.com Dictionary of English

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pernicious

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Concise Oxford English Dictionary © 2008 Oxford University Press:
pernicious /pəˈnɪʃəs/

▶adjective having a harmful effect, especially in a gradual or subtle way.

– derivatives
perniciously adverb,
perniciousness noun.

– origin ME: from L. perniciosus ‘destructive’, from pernicies ‘ruin’, based on nex, nec- ‘death’.

'pernicious' also found in these Oxford entries:

cobalamin - cyanocobalamin - pernicious anaemia

Forum discussions with the word(s) "pernicious" in the title:

fruitful as well as pernicious
pernicious enterprise

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