How to Say "terribly" in Spanish
The most common Spanish word for “terribly” is “fatal” — use 'fatal' when 'terribly' describes doing something badly or poorly, indicating a lack of skill or quality..
fatal
fah-TAHL/faˈtal/

Examples
Canto fatal, pero me encanta la música.
I sing terribly, but I love music.
¿Cómo te fue en el viaje? — Me fue fatal.
How did your trip go? — It went awfully.
Adverb Form
When 'fatal' acts as an adverb (telling you how something is done), it keeps the same form, 'fatal,' and doesn't need the usual '-mente' ending that many Spanish adverbs use.
terriblemente
teh-ree-bleh-MEN-teh/teˈriβleˈmente/

Examples
La película era terriblemente larga; duró tres horas.
The movie was terribly long; it lasted three hours.
Aunque no lo creas, el pastel estaba terriblemente delicioso.
Believe it or not, the cake was terribly delicious.
Necesitamos esto terriblemente rápido.
We need this terribly fast.
Adverb Form
Most Spanish adverbs ending in '-mente' are created by adding this suffix to the feminine form of an adjective (terrible is already feminine/masculine, so it stays the same).
Fatal vs. Terriblemente
Related Translations
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