This is the 8949th most frequent Portuguese word.
assustadores
Frightening or scary.
The word 'assustadores' describes the movies as having a quality that induces fear.
Os filmes de terror são assustadores.
Horror movies are scary.
Here, 'assustadores' modifies 'ruídos,' suggesting the noises were frightening.
Ouvi ruídos assustadores à noite.
I heard scary noises at night.
In this usage, 'assustadoras' refers to the stories, indicating that they evoke a sense of fear.