How to Say "stupid person" in Spanish
The Spanish word for “stupid person” is “estúpido” — B2 level.
English → SpanishB2
NounB2slang
a direct insult

Examples
¡No seas un estúpido! Piensa en las consecuencias.
Don't be an idiot! Think about the consequences.
Ese político es un estúpido, no sabe nada.
That politician is a stupid person, he doesn't know anything.
La estúpida de mi jefa me culpó por su error.
My idiot boss (female) blamed me for her mistake.
Gender for People
When used to talk about a person, this word changes to match their gender. You would call a man 'un estúpido' and a woman 'una estúpida'.
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