The movie was really scary/scaring
я знаю, что ответ - scary, мне он неважен
мне необходимо адекватное ОБЪЯСНЕНИЕ, почему здесь scary, а не scaring
не игнорьте, пожалуйста(

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"Scary" is the correct adjective to use in this context because it is describing the movie itself as being frightening or causing fear. "Scaring" is a present participle form of the verb "scare" which would be used to describe an ongoing action of causing fear. In this case, we are talking about the movie as a whole and how it made the viewer feel, so "scary" is the appropriate choice.