보이던데

was visible, looked, seemed

→ 보이다
verb · imperfect Rare #22,150
was visible
KO: 창문 밖으로 산이 보이던데.
EN: The mountains were visible outside the window.
looked, seemed
KO: 그 사람은 많이 피곤해 보이던데.
EN: That person looked very tired.
Conjugation of 보이다
Imperfect
보이던데

나는 재밌어 보이던데

It looked fun to me.

— 400번의 구타 (1959)

딸이 똑똑해 보이던데

Your daughter seemed really smart.

— 포풍추영 (2025)

별로 안 바빠 보이던데.

Tom didn’t look too busy.