This is the 379th most frequent Korean word.
없어
"없어" means "not have" or "not exist."
'없어' means 'do not have' or 'is not present' here, indicating the absence of the wallet.
나는 내 지갑이 없어.
I don't have my wallet.
'없어' is used to describe the nonexistence of a window in the room.
이 방에 창문이 없어.
This room does not have a window.
'없어' conveys the idea of having no tasks to perform or things to do.