insidious

The changes are insidious, and will not produce a noticeable effect for 15 to 20 years.

变化是悄然发生的，15到20年间不会产生明显效果。

He´s also found a kind of insidious prejudice.

他也发现了一种潜在的偏见。

But he´s also found a kind of insidious prejudice.

但他也发现了一种潜在的偏见。

This loss of culture memory, as insidious as Alzheimer´s disease, eats away at the soul of the nation, says Bertman, author of Hyperculuture.

《过度文化》一书的作者伯特曼（Bertman）说，文化记忆的丧失就像阿尔茨海默症一样潜伏，侵蚀着这个国家的灵魂。

The very reason that clichés so easily seep into our speech and writing—their insidious memorability—is exactly why they played such an important role in oral storytelling.

陈词滥调之所以如此容易渗透到我们的演讲和写作中，是由于它们潜在的可记忆性，这正是它们在口述故事中扮演如此重要角色的原因。