이 부족합니다

is insufficient

→ 이

phrase Rare #24,197

is insufficient Used after a noun to say that there is not enough of something. 이 is a subject marker, and 부족합니다 is the formal polite form of 부족하다.

KO: 시간이 부족합니다.

EN: There isn't enough time.

There isn't enough fabric.

— 스테이션 7 (2017)

I lack imagination.