This is the 8629th most frequent Dutch word.
hysterischer
More hysterical.
In this sentence, "hysterischer" is used as a comparative adjective to describe the escalating emotional intensity of the movie.
De film werd steeds hysterischer naarmate het einde naderde.
The movie became increasingly hysterical as it approached the end.
Here, "hysterischer" describes the comparative state of the voice conveying heightened emotion.
Zij riep met een hysterischer stem toen ze het nieuws hoorde.
She shouted with a more hysterical voice when she heard the news.
"Hysterischer" modifies the manner of their laughter to indicate its increased emotional expressiveness compared to ours.