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重い病気

serious illness

→ 重い
phrase Rare #25,032
serious illness Literally means “heavy illness”; 重い describes an illness as serious or severe.
JA: 彼は重い病気で入院しました。
EN: He was hospitalized with a serious illness.

あなたは流感になりかけているか、もっと重い病気かもしれません。

You may be coming down with the flu, or you might have something more serious.

彼の母親は大変重い病気だそうだ。

I hear his mother is seriously ill.

彼は私たちと一緒に食事になっていたが、突然重い病気にかかってしまった。

He was having a meal with us when he suddenly fell seriously ill.

重い病気にかかって次の年に亡くなったの

They came down with a serious illness and died the following year.

— When Marnie Was There (2014)

ひょっとすると彼女は重い病気かもしれない。

She might have a serious illness.

彼女は重い病気にかかっている。

She has a serious illness.