early 15c., from French imperceptible (early 15c.), from Medieval Latin imperceptibilis, from assimilated form of in- "not, opposite of" (see in- (1)) + perceptibilis (see perceptible). Related: Imperceptibly. OED marks imperceivable as "Now rare."
实用例句
1. Brian's hesitation was almost imperceptible.
布赖恩的犹豫几乎难以察觉。
来自柯林斯例句
2. imperceptible changes in temperature
难以觉察的气温变化
来自《权威词典》
3. The slight change in the taste was imperceptible to most people.
这种味道的细微变化对大多数人而言是无法觉察的.
来自《简明英汉词典》
4. She answered with an almost imperceptible nod of the head.
