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有害的，恶性的（常难以发觉） -
More pernicious still has been the acceptance of the author's controversial ideas by the general public.普通民众对作者这些有争议的观点的认可是更大的危害。
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the pernicious effects of jealousy嫉妒引起的危害
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She thinks television has a pernicious influence on our children.她认为电视对我们的孩子们产生有害的影响。