Something that is imperceptible is so small that it is not noticed or cannot be seen.
例句
Brian's hesitation was almost imperceptible.布賴恩的猶豫幾乎難以察覺。
英漢詞典釋義
adj.
感覺不到的
The slight change in the taste was imperceptible to most people.這種味道的細微變化對大多數人而言是無法覺察的。She answered with an almost imperceptible nod of the head.她幾乎不為人察覺地點了一下頭作為回答。His head moved in an almost imperceptible nod.他點頭的動作微小得幾乎看不出來。The transition is almost imperceptible.這種過渡幾乎覺察不到。
英英詞典釋義
Adjective
1. impossible or difficult to perceive by the mind or senses;
"an imperceptible drop in temperature""an imperceptible nod""color is unperceivable to the touch"