How to Say "horrendous" in Spanish
The Spanish word for “horrendous” is “horrendo” — B1 level.

Examples
Hoy hace un tiempo horrendo, mejor nos quedamos en casa.
The weather is awful today, we'd better stay home.
Ese cuadro me parece horrendo, no me gusta nada.
I find that painting hideous; I don't like it at all.
Fue un accidente horrendo que conmocionó a toda la ciudad.
It was a horrendous accident that shocked the whole city.
Changing the Ending
This word must match the person or thing you are describing. Use 'horrendo' for masculine words (el libro) and 'horrenda' for feminine words (la película).
Emphasis through Position
Usually, you put 'horrendo' after the thing you are describing. If you put it before (e.g., 'el horrendo crimen'), it adds a more dramatic, literary, or emotional tone.
Confusing with 'Scary'
Mistake: “Using 'horrendo' just because you are scared of a movie.”
Correction: Use 'de terror' or 'terrorífico' for movies. 'Horrendo' is more about something being objectively awful or incredibly ugly.
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