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

 

inaudible

 adjective
adjective
BrE BrE//ɪnˈɔːdəbl//
 
; NAmE NAmE//ɪnˈɔːdəbl//
 
 
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inaudible (to somebody) that you cannot hear She spoke in an almost inaudible whisper. The whistle was inaudible to the human ear. His voice was almost inaudible. The sound is inaudible to the human ear. opposite audible Word Origin late Middle English: from late Latin inaudibilis, from in- ‘not’ + audibilis, from audire ‘hear’.
See the Oxford Advanced American Dictionary entry: inaudible