Definition of imperceptible adjective from the Oxford Advanced Learner's Dictionary

 

imperceptible

 adjective
adjective
BrE BrE//ˌɪmpəˈseptəbl//
 
; NAmE NAmE//ˌɪmpərˈseptəbl//
 
(formal)
 
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very small and therefore unable to be seen or felt; opposite perceptible imperceptible changes in temperature The differences were imperceptible to all but the most trained eye. There was an almost imperceptible pause as she gathered her breath to speak. The slight change in the taste was imperceptible to most people.Word Familyperceive verbperception nounperceptive adjectiveperceptible adjective (imperceptible) Word Origin late Middle English: from French, or from medieval Latin imperceptibilis, from in- ‘not’ + perceptibilis, from the verb percipere ‘seize, understand’, from per- ‘entirely’ + capere ‘take’.
See the Oxford Advanced American Dictionary entry: imperceptible