How to Say "to rethink" in Spanish
The Spanish word for “to rethink” is “reconsiderar” — B1 level.

Examples
Por favor, reconsidera tu decisión.
Please, reconsider your decision.
Estamos reconsiderando los planes de viaje para el próximo año.
We are reconsidering the travel plans for next year.
El director tuvo que reconsiderar su postura después de la reunión.
The director had to reconsider his stance after the meeting.
The 'Re-' Prefix
Just like in English, adding 're-' to a verb in Spanish often means 'to do it again.' Since 'considerar' is regular, its 're-' version is perfectly regular too.
Direct Object Connection
You can use this word directly with the thing you are thinking about, like 'reconsiderar el plan' (reconsider the plan). You don't need a preposition like 'of' or 'about' between the words.
Using 'sobre' unnecessarily
Mistake: “Reconsiderar sobre la propuesta.”
Correction: Reconsiderar la propuesta. In Spanish, you reconsider the thing directly without needing a connecting word like 'about'.
Related Translations
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