This is the 15828th most frequent Polish word.
słynna
Famous.
Here, 'słynnym' (an adjective form of 'słynna') describes Warsaw, indicating its renown as a well-known city.
Warszawa jest słynnym miastem w Polsce.
Warsaw is a famous city in Poland.
In this case, 'słynna' is used to characterize the popularity of a specific book within a specific demographic.
Ta książka jest bardzo słynna wśród młodzieży.
This book is very famous among the youth.
The word 'słynną' modifies 'powieść' (novel), emphasizing that the novel is widely recognized or esteemed.