This is the 13352nd most frequent Swedish word.
underhållande
Entertaining.
In this sentence, 'underhållande' is used as an adjective to describe the action of the movie itself: it provided amusement and enjoyment to the viewer.
Filmen igår var verkligen underhållande.
The movie yesterday was truly entertaining.
Here, 'underhållande' describes the stories being told, implying they are amusing and engaging for the listener.
Hon berättar alltid så underhållande historier.
She always tells such entertaining stories.
In this context, 'underhållande' describes the quality of the lesson, signifying it was engaging and enjoyable for the attendees.