How to Say "joyful" in Spanish
The most common Spanish word for “joyful” is “alegre” — use 'alegre' to describe a person or thing that generally exhibits a cheerful disposition or a state of happiness..
alegre
/ah-LEH-greh//aˈle.ɣɾe/

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'.
felices
feh-LEE-ses/feˈli.ses/

Examples
Los niños están muy felices hoy.
The children are very happy today.
Les deseo unas felices fiestas.
I wish you happy holidays.
Fueron momentos felices para toda la familia.
They were happy moments for the whole family.
Special Plural Rule
When making the singular word 'feliz' plural, the 'z' must change to a 'c' before you add '-es'. This is a standard spelling change in Spanish for words ending in 'z'.
Adjective Agreement
'Felices' is used to describe two or more people or things. It looks the same whether you are describing a group of masculine nouns (los hombres felices) or feminine nouns (las mujeres felices).
Incorrect Pluralization
Mistake: “Los niños son 'felizs'.”
Correction: The correct plural is 'felices'. Always remember to change 'z' to 'c' and then add '-es'.
Singular vs. Plural Happiness
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