This is the 661st most frequent Persian word.
خالی
Empty.
خالی is used here to indicate the absence of something, specifically the clock.
ساعت روی دیوار خالی بود.
The clock on the wall was missing.
خالی is used here to indicate that the glass does not contain anything.
لیوان روی میز خالی است.
The glass on the table is empty.
خالی is used here to describe the notebook as being blank or unused.