How to Say "decided" in Spanish
The Spanish word for “decided” is “decidido” — A2 level. This is a very common word in everyday Spanish.

Examples
Todavía no hemos decidido dónde ir de vacaciones.
We still have not decided where to go on vacation.
Una vez decidido el plan, empezamos a trabajar.
Once the plan was decided, we started working.
La fecha para la boda fue decidida por mis padres.
The wedding date was decided by my parents.
The Perfect Tenses (Haber)
When used with the verb 'haber' (e.g., 'he,' 'has,' 'ha'), 'decidido' never changes its form. It always stays 'decidido', regardless of who is speaking or the object of the verb.
Passive Voice and Results (Ser/Estar)
When used with 'ser' (for passive voice) or 'estar' (for a resulting state), 'decidido' acts like an adjective and MUST change gender and number: 'La hora está decidida' (The time is decided).
Changing Gender with 'Haber'
Mistake: “Hemos decidida la cena.”
Correction: Hemos decidido la cena. (The participle only changes when used with 'ser' or 'estar', not 'haber'.)
Related Translations
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