Synonyms: inaudible, unhearable
Definition: impossible to hear; imperceptible by the ear
Usage: an inaudible conversation
Similar words: voiceless, breathed
Definition: uttered without voice
Usage: could hardly hear her breathed plea, `Help me'; voiceless whispers
Similar words: infrasonic
Definition: having frequencies below those of audible sound
Similar words: silent
Definition: having a frequency below or above the range of human audibility
Usage: a silent dog whistle
Similar words: silent, unsounded
Definition: not made to sound
Usage: the silent `h' at the beginning of `honor'; in French certain letters are often unsounded
Similar words: ultrasonic, supersonic
Definition: having frequencies above those of audible sound
Similar words: unheard
Definition: not necessarily inaudible but not heard