How to Say "hideous" in Spanish
The Spanish word for “hideous” is “espantoso” — A2 level. This is a very common word in everyday Spanish.
English → SpanishA2
adjectiveA2
describing appearance

Examples
La comida en ese restaurante era espantosa.
The food in that restaurant was awful.
Llevaba un traje espantoso a la boda.
He wore a hideous suit to the wedding.
Tuvimos un tráfico espantoso al salir de la ciudad.
We had dreadful traffic leaving the city.
Agreement is Key
Since 'espantoso' is an adjective, make sure it matches the thing it describes in gender (o/a) and number (s/es). E.g., 'una película espantosa' (a horrible movie).
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