Definition of imperceptibly adverb from the Oxford Advanced Learner's Dictionary

 

imperceptibly

 adverb
adverb
BrE BrE//ˌɪmpəˈseptəbli//
 
; NAmE NAmE//ˌɪmpərˈseptəbli//
 
(formal)
 
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in a very small way that cannot be seen or felt The daylight faded almost imperceptibly into night. opposite perceptibly