inaudible

[in-aw-duh-buhl]
adjective
not audible; incapable of being heard.

Origin:
1595–1605; in-3 + audible

inaudibility, inaudibleness, noun
inaudibly, adverb
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World English Dictionary
inaudible (ɪnˈɔːdəbəl)
 
adj
not loud enough to be heard; not audible
 
inaudi'bility
 
n
 
in'audibleness
 
n
 
in'audibly
 
adv

Collins English Dictionary - Complete & Unabridged 10th Edition
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Example sentences
People may one day be able to hear what are now inaudible sounds, scientists
  say.
They have whistles inaudible to humans that attach to your bumper to scare deer
  out of your way.
In it's evanescent state it is inaudible, invisible, although it has a clear
  impact on the localized state.
He dropped it, there was an invisible, inaudible explosion of neutrons but
  everybody knew.
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