Delusions are sometimes insidiously destructive.是什么意思？

Delusions are sometimes insidiously destructive.

妄想有时也具有潜在的破坏性。

delusions

n. 欺骗( delusion的名词复数 )，谬见，错觉，妄想；

例句
She has some cockeyed delusions about becoming a pop star.
她还幻想着自己能成为流行歌星。

are

vi. （用于第二人称单复数现在时，第一、三人称复数现在时）是；n. 公亩（等于100平方米）；

例句
We are scared to abandon ourselves to our feelings in case we seem weak or out of control.
我们不敢放纵自己的情感，以免显得太过软弱或缺乏自制。

sometimes

adv. 有时，间或，时

例句
I want to work at home on a Tuesday but as it turns out sometimes it's a Wednesday or a Thursday.
我想周二在家工作，但实际上有时却是周三或是周四。

insidiously

adv. 潜在地，隐伏地，阴险地；

例句
Actinobacillosis develops insidiously in soft tissues.
放线杆菌病是在软组织中呈隐袭性发生的.

destructive

adj. 破坏性的，毁灭性的，有害的；

例句
There is at last an apparent end to the destructive price war.
这场惨烈的价格战貌似终于结束了。