ˌhard of ˈhearing adjective [not before noun]

1. unable to hear very well ⇒ deaf

2. the hard of hearing [plural] people who are unable to hear very well

[TahlilGaran] Dictionary of Contemporary English ▲

deaf adjective physically unable to hear anything, or unable to hear well:
Deaf people use sign language to communicate.
be hard of hearing to have difficulty hearing things, for example because you are old:
You’ll have to speak up – she’s a bit hard of hearing.
subtitles for the hard of hearing
hearing-impaired formal adjective having a permanent physical condition which makes it difficult for you to hear things:
Not all hearing-impaired people are completely deaf.

[TahlilGaran] English Thesaurus ▲

hard of hearing
unable to hear well, partially deaf
My grandfather is hard of hearing.

The man is hard of hearing so you must speak loudly when talking to him.

[TahlilGaran] English Idioms Dictionary ▲

hard of hearing
adj. Partially deaf.
Some people who are hard of hearing wear hearing aids.

[TahlilGaran] English Idioms Dictionary ▲