asombroso
/asomˈbɾoso/ · B1 · adj
amazing, wondrous, breathtaking, awesome
a- + sombra (shadow) + -oso: so startling it throws a shadow over you
From asombrar, built on sombra (shadow): originally to spook, as a horse shies at a shadow. The fright softened into wonder, so asombroso means amazing or astonishing. The ending -oso means full of, like English -ous.