피곤해서요

because (I’m) tired

→ 피곤하다
adjective Rare #21,813
because (I’m) tired A polite way to give a reason, often used as a sentence ending.
KO: 왜 일찍 자요? 피곤해서요.
EN: Why are you going to bed early? Because I’m tired.
Forms of 피곤하다

무척 피곤해서요

Because I'm extremely tired.

— 싸이코 (1960)

미안하지만 피곤해서요

Sorry, but I'm tired.

— 그을린 사랑 (2010)

미안한데 피곤해서요

Sorry, I’m just a little tired.

— 로렌스 애니웨이 (2012)