impairs; impaired; impairing
: to make (something) weaker or worse
Smoking can impair your health.
His memory was so impaired by age that he often forgot where he was.
Drinking impairs a person's ability to think clearly.
— impaired /ɪmˈpeɚd/ adjective [more impaired; most impaired]
The disease causes impaired vision/hearing in elderly people.
— sometimes used in combination
hearing-impaired people [=people with impaired hearing]