imperceptible
/ˌɪmpəˈseptəbl/adjective
- impossible to perceive感觉不到的, 难以察觉的, 细微的：
his head moved in an almost imperceptible nod.
他微微点了点头。
派生词
imperceptibility
/ˈɪmpəˌseptəˈbɪlətɪ/ nounimperceptibly
adverb词源
late Middle English: from French， or from medieval Latin imperceptibilis, from in- 'not' + perceptibilis， from the verb percipere （see PERCEIVE）.