This is the 9983rd most frequent French word.
fun
Enjoyment or amusement.
The word 'fun' is used as an adjective to describe the enjoyable nature of the game.
Hier soir, nous avons joué à un jeu très fun.
Last night, we played a very fun game.
Here, 'fun' is used informally to describe the exciting or entertaining nature of skydiving.
Ça a l'air vraiment fun de faire du parachutisme.
Skydiving really looks fun.
In this instance, 'fun' is deployed as an informal adjective to express the enjoyable and entertaining qualities of the movie.