imperceptible

形容词

1. 1

   察觉不到的、感觉不到的

   The change in temperature was almost imperceptible to us.

   温度的变化对我们来说几乎察觉不到。

2. 2

   极微小的、细微的

   She gave an imperceptible nod to signal that we should leave.

   她极轻微地点了个头，示意我们该走了。