How to Say "hideousness" in Spanish
The Spanish word for “hideousness” is “horror” — B2 level.

Examples
Me da horror la suciedad y el desorden.
Dirt and disorder give me the creeps/fill me with disgust.
Tu apartamento es un horror después de la fiesta.
Your apartment is a disaster/a terrible mess after the party.
El vestido de la novia era un horror, pero ella estaba feliz.
The bride's dress was hideous/an absolute horror, but she was happy.
Using 'Dar'
When expressing that something causes you disgust or revulsion, use the structure Me da horror... (It gives me horror...), similar to how you use Me gusta.
Confusing Repulsion with Fear
Mistake: “Using 'Tengo horror' to mean 'I am disgusted.'”
Correction: For disgust, use *Me da horror* or *Siento asco*. *Tengo horror* usually means 'I have a profound dread/fear.'
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