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|Adj.||1.||unhearable - impossible to hear; imperceptible by the ear; "an inaudible conversation"|
imperceptible, unperceivable - impossible or difficult to perceive by the mind or senses; "an imperceptible drop in temperature"; "an imperceptible nod"; "color is unperceivable to the touch"
quiet - free of noise or uproar; or making little if any sound; "a quiet audience at the concert"; "the room was dark and quiet"
Based on WordNet 3.0, Farlex clipart collection. © 2003-2012 Princeton University, Farlex Inc.