frightening(scary) adjective [UK: ˈfraɪt.n̩.ɪŋ] [US: ˈfraɪt.n̩.ɪŋ]It will be frightening. = Será aterrador.
terrifying(frightening or intimidating) adjective [UK: ˈte.rɪ.faɪ.ɪŋ] [US: ˈte.rə.ˌfaɪ.ɪŋ]This is absolutely terrifying. = Esto es absolutamente aterrador.
aterradoradverb
scary(causing fear or anxiety) adverb [UK: ˈskeə.ri] [US: ˈske.ri]It will be scary. = Será aterrador.