You searched for: “hypoacuses
hypoacusis (s) (noun), hypoacuses (pl)
Reduced or slightly impaired hearing which often involves neurosensory organs: "In the early 1930's, when Bill realized that he was experiencing hypoacusis, he could not afford a hearing aid; so, he put a small button on a string, put the button in his ear and the string in his pocket and, as a result, Bill noticed that people automatically spoke louder and so he had no trouble understanding them."