Deaf

1. Unable to hear, or only partially able to hear.
2. Unwilling to listen or be persuaded; determinedly inattentive; regardless.
3. Obscurely heard; stifled; deadened.
4. (obsolete, Britain, dialect) Decayed; tasteless; dead.
5. (with "the") Those who are deaf, taken as a group.

hard of hearing

hearing-impaired