How to Say "dreadfully" in Spanish
The Spanish word for “dreadfully” is “terriblemente” — B1 level. This is a very common word in everyday Spanish.
English → SpanishB1
adverbB1
as a measure of degree

Examples
La película era terriblemente larga; duró tres horas.
The movie was extremely 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).
Other Meanings of “terriblemente”
“terriblemente” can also mean:
- describing the manner of an action(C1)
Related Translations
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