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やむ
verb-godan
to be ill; to suffer
1. to be ill; to fall sick
To become physically ill or to suffer from a disease. Often literary in tone.
長年(ながねん)()()んでいる。
He has been suffering from a stomach condition for years.
過労(かろう)(からだ)()んで、入院(にゅういん)することになった。
He fell ill from overwork and ended up being hospitalized.
2. to be troubled; to be mentally unwell
To suffer psychologically, to be in mental anguish, or to have one's mind or heart affected by worry or distress. Very common in modern usage, especially in the form 病んでいる.
(こころ)()む。
To become mentally ill.
あの()最近(さいきん)()んでるっぽい。
That person seems to be in a dark place lately.
SNSの誹謗中傷(ひぼうちゅうしょう)精神的(せいしんてき)()んでしまった。
The online slander took a toll on their mental health.
仕事(しごと)のストレスで()んで会社(かいしゃ)()めた(ひと)(すく)なくない。
There are not a few people who quit their jobs after becoming mentally worn down by work stress.

USAGE:
A godan verb (五段活用(ごだんかつよう): ()まない、()みます、()む、()めば、()もう). While the physical illness sense (sense 1) is somewhat literary, the mental health sense (sense 2) is very common in modern Japanese, especially among younger speakers.

MODERN USAGE:
The ている form ()んでいる (colloquially ()んでる) is widely used in casual speech and online to describe someone who seems mentally troubled, depressed, or emotionally unstable. This casual usage has become pervasive in youth language.

COMMON COLLOCATIONS:

  • (こころ)()む: to become mentally ill
  • (からだ)()む: to fall physically ill
  • 精神(せいしん)()む: to suffer a mental illness
  • ()んでる: to be in a bad mental state (casual)