This is the 11627th most frequent Korean word.
난청
Hearing loss.
Here, '난청' refers to a physical condition of difficulty in hearing.
그는 난청으로 인해 상대방의 말을 잘 이해하지 못해요.
He cannot understand the other person's words well due to hearing loss.
In this sentence, '난청' is used to describe a past experience of hearing difficulties.
어릴 때 난청을 앓았던 경험이 그의 인생을 바꾸었다.
His experience with hearing impairment during childhood changed his life.
'난청' is used in a general sense to describe the medical or physiological condition requiring care.