Inaudible is another way of saying "hushed" or "silent." If you thought the bad words you muttered under your breath were inaudible, perhaps you should've turned off that microphone in front of you!

In Latin, audire means “to hear,” so it makes sense, then, that inaudible means “imperceptible by the ear,” since in- means “not.” You should strive to speak in a near-inaudible whisper if you need to talk to your seatmate at the opera, but in normal, everyday conversation, you won’t get your point across unless you talk at a louder volume. Synonyms for inaudible range from faint and muffled to uncommunicative and voiceless.

Definitions of inaudible
  1. adjective
    impossible to hear; imperceptible by the ear
    “an inaudible conversation”
    synonyms: unhearable
    breathed, voiceless
    uttered without voice
    having frequencies below those of audible sound
    having a frequency below or above the range of human audibility
    silent, unsounded
    not made to sound
    supersonic, ultrasonic
    having frequencies above those of audible sound
    not necessarily inaudible but not heard
    imperceptible, unperceivable
    impossible or difficult to perceive by the mind or senses
    free of noise or uproar; or making little if any sound
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    audible, hearable
    heard or perceptible by the ear
    making a clunking sound
    relating to audible sound
    making or having a sound as specified; used as a combining form
    characterized by or producing sound of great volume or intensity
    capable of being perceived by the mind or senses
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