This is the 260th most frequent Turkish word.
oldukça
"Quite" or "rather."
Here, 'oldukça' is used to describe a notable level of temperature, meaning 'rather' or 'quite' in English.
Oldukça sıcak bir gün geçirdik, güneş hiç batmadı.
We spent a rather hot day; the sun never set.
In this sentence, 'oldukça' denotes a significant extent of the oldness of the book, used similarly to 'fairly' or 'quite' in English
Bu kitap oldukça eski, ama hâlâ okunabilir.
This book is quite old, but still readable.
The word 'oldukça' is employed here to emphasize the degree of 'interesting and engaging' qualities of the movie, translating to 'quite' in English.