How to Say "undecided person" in Spanish
The Spanish word for “undecided person” is “indeciso” — B1 level.
English → SpanishB1
nounB1
someone who hasn't made up their mind

Examples
Los políticos siempre hablan para los indecisos.
Politicians always speak for the undecided (people).
Había muchos indecisos en la reunión.
There were many undecided people at the meeting.
Como buen indeciso, tardó horas en comprar la camisa.
Like a typical indecisive person, he took hours to buy the shirt.
Turning an Adjective into a Noun
In Spanish, you can put 'el', 'la', 'los', or 'las' in front of this word to turn it into 'the undecided person' or 'the undecided people' without needing the word 'persona'.
Related Translations
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