Pernicious
/pəˈrnɪʃəs/
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Definition
(adj) Causing much harm in a subtle way.
Sentence Examples
Pervasive and pernicious deviations from both fact and logical validity lurked behind a meretricious plausibility.
I think that the romantic myth is one of the most pernicious of our times.
CEFR Practice Quiz
The ____ effects of misinformation on public health became evident during the pandemic.