How to Say "foolish" in Spanish
The most common Spanish word for “foolish” is “tonto” — use 'tonto' to describe something or someone lacking good sense or judgment, often in a lighthearted or harmless way, like a silly joke or a simple mistake..
tonto
/TON-toh//ˈtonto/

Examples
Fue una broma tonta, pero todos nos reímos.
It was a silly joke, but we all laughed.
No seas tonto, claro que puedes hacerlo.
Don't be silly, of course you can do it.
Me siento tonta por haber olvidado las llaves.
I feel foolish for having forgotten the keys.
Matching the Noun
Like many describing words in Spanish, 'tonto' changes to match the person or thing it's describing. Use 'tonto' for masculine things ('el niño tonto') and 'tonta' for feminine things ('la idea tonta'). For groups, use 'tontos' or 'tontas'.
Forgetting to Change the Ending
Mistake: “La chica es tonto.”
Correction: Say 'La chica es tonta.' Describing words almost always need to match the gender (masculine/feminine) of the noun they describe.
bobo
BOH-boh/ˈboβo/

Examples
Mi hermano es muy bobo; siempre se ríe de sus propios chistes.
My brother is very silly; he always laughs at his own jokes.
No seas tan boba y revisa el contrato antes de firmar.
Don't be so foolish and check the contract before signing.
Fue una idea muy boba salir sin paraguas cuando estaba lloviendo.
It was a very silly idea to go out without an umbrella when it was raining.
Adjective Agreement
'Bobo' must change its ending to match the person it describes: 'bobo' for males and 'boba' for females. Use 'bobos' or 'bobas' for groups.
Confusing Ser and Estar
Mistake: “Using 'estar bobo'.”
Correction: Use 'ser bobo' (to be a silly person in general). You only use 'estar' if someone is temporarily stunned or dazed: 'Estaba bobo después del golpe' (He was dazed after the hit).
idiota
/ee-dee-OH-tah//iˈðjota/

Examples
Fue una decisión idiota vender el coche.
It was an idiotic decision to sell the car.
Me hizo una pregunta totalmente idiota.
He asked me a totally stupid question.
An Adjective That Doesn't Change Its Ending
'Idiota' is special because its ending doesn't change for masculine or feminine things. It's always 'idiota'. For example: 'un plan idiota' (a stupid plan) and 'una idea idiota' (a stupid idea).
Trying to Make it Masculine
Mistake: “Quiso hacer un chiste idioto.”
Correction: Say 'un chiste idiota'. The word 'idiota' always ends in '-a', even when it's describing a masculine noun.
estúpidas
Examples
Tus excusas son realmente estúpidas, no te creo.
Your excuses are really stupid, I don't believe you.
imbéciles
Examples
Tomaron decisiones muy imbéciles.
They made very stupid decisions.
Choosing Between 'Tonto', 'Bobo', and 'Idiota'
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