aterrador

adj. frightening; appalling, shocking

adj. astounding, startling

= frightening, terrifying, terrorising [terrorizing, -USA], frightful, fear-inducing, hideous, hair-raising.
Ex: No echo of so frightening a concept, 'class', ever lingers within the hushed precincts of our libraries.
Ex: To the general public 'the female librarian is still angular, elderly, acidulous and terrifying', to use Geoffrey Langley's words, 'and a male librarian is impossible under any hypothesis'.
Ex: He perceived that his life threatened to be an interminable succession of these mortifying interviews unless he could discover a way or ways to deal with her surly and terrorizing ferocity.
Ex: The book, written by a man who is not a military historian as such, is concerned above all with showing the war's hideousness, its frightful human cost, its pathos and loss, and its essential failure to achieve its objectives.
Ex: The author suggests that the ability to enjoy fear-inducing media increases with age.
Ex: The book focuses on images where hideous atrocities -- e.g., murder, blasphemy, wanton destruction and even cannibalism -- are shown to be part of the daily life of the common people of Paris during the revolution.
Ex: This 'hair-raising' experience will allow students to have a better understanding of what energy is and why it's so important.