/ ɪnˈɔːdəbl; NAmE / adjective
inaudible (to sb) that you cannot hear :
The whistle was inaudible to the human ear.
OPP audible
► in·audi·bil·ity / ɪnˌɔːdəˈbɪləti; NAmE / noun [ U ]
► in·aud·ibly / ɪnˈɔːdəbli; NAmE / adverb
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WORD ORIGIN
late Middle English : from late Latin inaudibilis , from in- not + audibilis , from audire hear.