imperceptible
imperceptible — 形容詞
1. too small, slow, or faint for a person to notice or feel.
難以察覺
微小或緩慢到無法被察覺
too small, slow, or faint for a person to notice or feel.
Over many years, the glacier moved at an almost imperceptible speed, reshaping the valley floor.
多年來，冰川以幾乎難以察覺的速度移動，重塑了山谷的地形。
collocation: almost imperceptible
Leila noticed an imperceptible shift in her mother's tone that others missed.
Leila 察覺到母親語調中一絲難以察覺的變化，其他人似乎都沒注意到。
imperceptible + shift / change / difference
The difference between the two paint samples was imperceptible to everyone except the decorator.
這兩種油漆樣本的差異除了油漆工以外，所有人都難以察覺。
The tension between the two colleagues was almost imperceptible to outsiders, though their teammates felt it clearly.
兩位同事之間的緊張氣氛外人幾乎難以察覺，但他們的組員卻都明顯感受到。
- unnoticeable
less formal and more common in everyday speech; imperceptible is more precise for extreme subtlety
- indiscernible
very close in meaning but slightly more formal; often used for visual differences
- subtle
broader in meaning; can describe cleverly indirect or refined details, not just extremely slight ones
- perceptible
direct antonym; the exact opposite in formal contexts
- noticeable
common opposite in everyday language
- obvious
stronger opposite; something easily seen or understood
用法筆記
Often paired with almost (almost imperceptible) or to (imperceptible to the naked eye, imperceptible to someone). More common in written descriptions and formal speech than in everyday conversation.