How to Say "horribly" in Spanish
The Spanish word for “horribly” is “terriblemente” — C1 level.

Examples
El equipo se desempeñó terriblemente en la segunda mitad del partido.
The team performed horribly in the second half of the game.
El cantante desafinó y sonó terriblemente.
The singer sang out of tune and sounded dreadful.
Ella se sintió terriblemente enferma después de comer el marisco.
She felt terribly ill after eating the seafood.
Modifying Verbs
This adverb usually follows the verb it is describing, telling you how the action was done: 'jugó terriblemente' (played horribly).
Overuse of Literal Meaning
Mistake: “Using 'terriblemente' exclusively for negative actions when 'muy' or 'extremadamente' would be better for neutral intensity.”
Correction: Reserve this literal meaning for situations where the action was genuinely bad or awful, like 'jugó terriblemente.'
Related Translations
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