疲れてるの

I'm tired

→ 疲れる
phrase Uncommon #9,380
I'm tired The sentence-ending の adds an explanatory or slightly soft tone, like “you see” or “it's because.” Depending on intonation, it can also form a question. The related ending んだ is used similarly.
JA: 今日はちょっと疲れてるの。
EN: I'm a little tired today.

疲れてるの

I'm tired right now.

私はすごく疲れてるの

I'm really tired.

— 嵐の中で (2018)

疲れてるの

I'm tired.

— サイコ (1960)

ドイツ語授業後で疲れてるの

He's tired after German class.

子供たちは疲れてるの

The kids are tired.

なんでそんなに疲れてるの

Why are you so tired?

トム何で疲れてるの

Why is Tom tired?

彼は疲れてるの

He's tired.

— 8 1/2 (1963)