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

Examples
La vista desde el mirador es absolutamente impresionante.
The view from the viewpoint is absolutely breathtaking.
Tu habilidad para hablar tres idiomas es impresionante.
Your ability to speak three languages is impressive.
Compramos un televisor con una calidad de imagen impresionante.
We bought a television with stunning image quality.
Gender is Easy!
This adjective is special because it stays 'impresionante' whether you are describing a masculine noun (el coche impresionante) or a feminine noun (la casa impresionante). It does not change gender.
Making it Plural
To describe more than one thing, simply add '-s' to the end: 'impresionante' becomes 'impresionantes'. Example: 'Los efectos especiales son impresionantes'.
Forgetting the Plural
Mistake: “Las montañas eran impresionante.”
Correction: Las montañas eran impresionantes. (Because 'montañas' is plural, the adjective must also be plural.)
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