ADJ-GRADED
有害的;恶性的
If you describe something as pernicious, you mean that it is very harmful.
例句
I did what I could, but her mother's influence was pernicious...
我已尽力了,但是她母亲贻害颇深。
There is a pernicious culture of excellence: everything has to be not merely good but the best.
对于优秀存在着一种认识的误区:一切都务求最好。