inaudible

1. Impossible to hear;
   Imperceptible by the ear (synset 300175640)
   "an inaudible conversation"
   also:

   • imperceptible, unperceivable - impossible or difficult to perceive by the mind or senses
   • quiet - free of noise or uproar; or making little if any sound
   tells us about: audibility, audibleness - quality or fact or degree of being audible or perceptible by the ear
   similar to:

   • breathed, voiceless - uttered without voice
   • infrasonic - having frequencies below those of audible sound
   • silent - 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
   • unheard - not necessarily inaudible but not heard
   same as: unhearable

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