How to Say "suddenness" in Spanish
The Spanish word for “suddenness” is “repente” — B1 level. This is a very common word in everyday Spanish.

Examples
Estábamos tranquilos, y de repente, empezó a llover muchísimo.
We were calm, and suddenly, it started raining heavily.
Ella se levantó de repente y salió de la habitación.
She got up all of a sudden and left the room.
El perro ladró de repente y nos asustó a todos.
The dog barked unexpectedly and scared all of us.
The Fixed Phrase 'De Repente'
In modern Spanish, 'repente' is always paired with the preposition 'de' (from) to create the adverbial phrase 'de repente.' This phrase acts as a single word that modifies the verb, telling you how an action happened.
Using 'Repente' as an Adjective
Mistake: “El cambio fue muy repente.”
Correction: El cambio fue muy súbito. (Use the adjective 'súbito' instead, or restructure: 'El cambio ocurrió de repente.')
Related Translations
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