体調が悪いの

feel unwell

→ 体調
phrase Rare #34,065
feel unwell The final の adds an explanatory or conversational tone. With rising intonation, the phrase can be a question: “Are you feeling unwell?”
JA: 今日は体調が悪いの。
EN: I’m feeling unwell today.

体調が悪いの?

Are you feeling unwell?

体調が悪いの

I'm not feeling well.

— 嵐の中で (2018)

毎朝、体調が悪いの。

I feel sick every morning.

今日は少し体調が悪いの。

I'm feeling a little under the weather today.

いや、彼女は全く問題ないでは、あなたの体調が悪いの?

No, she's perfectly fine. So, are you feeling unwell?

— バジュランギおじさんと、小さな迷子 (2015)