This is the 110th most frequent Urdu word.
ایسی
"ایسی" in English means "such" or "like this."
It emphasizes the uniqueness or special attribute of the book.
ایسی کتاب میں نے پہلے کبھی نہیں دیکھی۔
I have never seen such a book before.
It is used to describe the nature of the situation being referred to.
ایسی صورتحال میں کیا کرنا چاہیے؟
What should be done in such a situation?
It expresses admiration or acknowledgment of the excellence of the performance.