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

Examples
La comida en ese restaurante fue decepcionante.
The food at that restaurant was disappointing.
Fue un resultado decepcionante para el equipo nacional.
It was a disappointing result for the national team.
A pesar de las altas expectativas, la secuela resultó ser decepcionante.
Despite the high expectations, the sequel turned out to be disappointing.
One Form for All
This word ends in -e, which means it doesn't change for men or women. You can use it with 'el' or 'la' without changing the ending.
Using it with 'Ser'
We usually use this with the verb 'ser' (to be) because we are describing a quality or characteristic of a thing, like a movie or a game.
The 'False Friend' Trap
Mistake: “Using 'decepcionante' to mean 'deceptive'.”
Correction: In Spanish, 'decepcionante' means disappointing. If you want to say something is misleading or deceptive, use 'engañoso'.
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