Deafness' is a condition in which a person has difficulty hearing or is unable to hear at all. Tone is the quality of sound that distinguishes different words and sounds. Asonia is a term used to describe a type of deafness caused by damage to the inner ear, which affects the ability to detect changes in pitch and tone. This type of deafness can be caused by a variety of factors, including genetic disorders, infections, and exposure to loud noises.