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具合が悪いの

not feeling well

→ 具合
phrase Uncommon #16,766
not feeling well 具合が悪い literally means that someone’s condition is bad. The の at the end can add an explanatory tone or, with rising intonation, make it a question.
JA: 今日は具合が悪いの。
EN: I'm not feeling well today.

トムもメアリーもまだ具合が悪いの？

Are both Tom and Mary still feeling sick?

具合が悪いの

I'm feeling sick.

— パディントン２ (2017)

すごく具合が悪いのです。

I feel really sick.

トムは具合が悪いの？

Is Tom feeling sick?

具合が悪いの？

Are you feeling unwell?

— 魔女の宅急便 (1989)

マルチェロお父さんの具合が悪いのよ

Marcello, your father is sick.

— 甘い生活 (1960)

カメラの具合が悪いの。

There's something wrong with the camera.

お水のせいで具合が悪いの

I'm feeling sick because of the water.

— ８ 1／2 (1963)