How to Say "cheerful" in Spanish
The Spanish word for “cheerful” is “alegre” — A1 level. This is a very common word in everyday Spanish.

Examples
Mi abuela es una persona muy alegre y siempre está sonriendo.
My grandmother is a very cheerful person and is always smiling.
Estuvimos muy alegres después de recibir la buena noticia.
We were very happy after receiving the good news.
¿Por qué no estás alegre hoy? ¿Pasó algo?
Why aren't you happy today? Did something happen?
Agreement with Nouns
Since 'alegre' ends in '-e', it always stays the same regardless of whether you are describing a man or a woman. It only changes when describing multiple people or things: 'alegres'.
Ser vs. Estar
Use 'ser' (Ella es alegre) to describe a person's lasting personality or character, and 'estar' (Él está alegre) to describe a temporary feeling or mood right now.
Using 'alegro' for masculine
Mistake: “El chico está alegro.”
Correction: El chico está alegre. 'Alegre' is the form used for both men and women because it ends in '-e'.
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