pernicious
/pəˈnɪʃəs; pɚ`nɪʃəs/ adj
(fml 文) ~ (to sb/sth) having a very harmful or destructive effect (on sb/sth) 有害的; 恶性的; 破坏性的
a pernicious influence on society 对社会有害的影响
a pernicious campaign to blacken his character 旨在诋毁他的人格的恶意宣传活动
Pollution of the water supply reached a level pernicious to the health of the population. 水源污染已达到危及居民健康的程度.