espantoso
/espanˈtoso/ · B1 · adj
ghastly, gruesome, dreadful, awful, godawful, horrific, horrendous, horrible, terrible
👻 espanto (fright) + -oso (-ous) = fright-ous, so frightful or dreadful
Espanto comes from Latin ex- + pavere, to be afraid, which also gives Spanish pavor (dread). The suffix -oso works like English -ous: frightful, dreadful, awful.