形容词很有害的，恶性的，致命的，险恶的; 引起巨大伤害的; 毁灭性的

形容词

1. Smoking is a pernicious habit.
抽烟是一种有害的习惯。

1. 有害无益的：permissive 宽容的;许可的 | pernicious 有害无益的 | pornographic 色情的

2. 恶性的：permutation test 排列检定 | pernicious 恶性的 | peroxidase method 过氧化物酶法

3. 有害的,致命的：shrill 尖锐的 刺耳的 | pernicious 有害的 致命的 | propitious 吉利的

1. 有害的；恶性的
If you describe something as pernicious, you mean that it is very harmful.

e.g. 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。
e.g. 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。

adj

1. working or spreading in a hidden and usually injurious way

e.g. glaucoma is an insidious disease
a subtle poison

Synonym: insidioussubtle

2. exceedingly harmful

Synonym: banefuldeadlypestilent