INAUDIBLE
Source: 566, 567
inaudible. Inaudible, a. not to be heard, void of sound
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In‐au″di‐ble (?), a. [[L. inaudibilis; pref. in- not + audire to hear: cf. F. unaudible. See In- not, and Audible.]] Not audible; incapable of being heard; silent. — In‐au″di‐ble‐ness, n. — In‐au″di‐bly, adv.