This is the 484th most frequent Dutch word.
bepaald
Certain; specific.
In this sentence, 'bepaald' is used as an adjective meaning 'certain' to specify a particular book being sought.
Ik ben op zoek naar een bepaald boek in deze bibliotheek.
I am looking for a certain book in this library.
Here, 'bepaald' is used as an adjective in an abstract sense, conveying 'certain' as a manner or aspect.
In een bepaald opzicht had hij gelijk.
In a certain way, he was correct.
In this context, 'bepaald' is used adverbially, meaning 'exactly,' often to emphasize the negation of the following term.