How to Say "determined" in Spanish
The most common Spanish word for “determined” is “decidido” — use 'decidido' when referring to someone's resolute character or a strong internal decision to achieve something..
decidido
deh-see-DEE-doh/de.θiˈði.ðo/

Examples
Llegó al examen con una actitud muy decidida.
She arrived at the exam with a very determined attitude.
El presidente se mostró decidido a implementar los cambios.
The president showed himself to be resolute in implementing the changes.
Eres muy decidido, siempre sabes lo que quieres.
You are very determined; you always know what you want.
Adjective Agreement
Like all Spanish adjectives, 'decidido' must match the person or thing it describes in both gender and number: 'Ella es decidida' (She is determined) vs. 'Ellos son decididos' (They are determined).
determinado
/deh-tehr-mee-NAH-doh//deteɾmiˈnaðo/

Examples
Ella es una mujer muy determinada y valiente.
She is a very determined and brave woman.
Dio un paso determinado hacia la puerta.
He took a resolute step toward the door.
Using with 'Ser' vs 'Estar'
Use 'ser' if you are describing a person's character (they are a determined person). Use 'estar' if they have made up their mind about a specific goal right now.
resuelto
/reh-SWELL-toh//reˈswelto/

Examples
Su actitud resuelta impresionó a todos en la reunión.
His determined attitude impressed everyone at the meeting.
Necesitas ser más resuelta si quieres ser líder del equipo.
You need to be more resolute if you want to be the team leader.
Describing Character
When 'resuelto' describes a permanent personality trait (determined, decisive), you often use the verb 'ser' (to be): 'Ella es resuelta'.
firme
FEER-meh/ˈfiɾme/

Examples
El director mantuvo una postura firme durante la negociación.
The director maintained a firm stance during the negotiation.
Necesitas ser firme con los niños para que te respeten.
You need to be firm with the children so they respect you.
Decidido vs. Determinado
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