unhearable

Từ điển WordNet v3.1 - WordNet Dictionary

adjective

impossible to hear;
imperceptible by the ear
- an inaudible conversation
• Syn:
inaudible
• Ant:
audible (for: inaudible)
• Similar to:
breathed, voiceless, infrasonic, silent, unsounded,
supersonic, ultrasonic, unheard
• See Also:
imperceptible, unperceivable, quiet
• Derivationally related forms:
inaudibleness (for: inaudible), inaudibility (for: inaudible)
• Attrubites:
audibility, audibleness