نیست

نیست

"نیست" means "is not" or "does not exist."

Here, "نیست" signifies the absence of the person from the location.

او اینجا نیست.

He/She is not here.

In this context, "نیست" expresses the lack of necessity for the action.

ما چیزی برای گفتن نداریم،‌ پس صحبت نمی‌کنیم چون نیاز نیست.

We have nothing to say, so we don't talk because it is not necessary.

In this sentence, "نیست" is negating the identity of the subject with its predicate.

این کتاب نیست.

This is not a book.