How to Say "stupidity" in Spanish
The most common Spanish word for “stupidity” is “estupidez” — use 'estupidez' when referring to the abstract quality or state of being foolish, or a specific foolish act or remark, often with a slightly more formal or serious tone..
estupidez
es-too-pee-DES/estuˈpiðeθ/

Examples
No puedo creer la estupidez que dijo en la reunión.
I can't believe the stupid thing (or foolish remark) he said in the meeting.
La estupidez humana a veces me sorprende.
Human stupidity sometimes surprises me.
Cometimos una estupidez al salir sin paraguas.
We committed a foolish act by leaving without an umbrella.
Gender Rule for -ez
Most Spanish nouns that end in -ez are feminine, like 'estupidez' and 'rapidez' (speed). Always use 'la' or 'una' with them.
Using the wrong gender
Mistake: “El estupidez”
Correction: La estupidez. Remember that this noun is feminine, so use the article 'la'.
tontería
Examples
¡Deja de decir tonterías y escúchame!
Stop talking nonsense and listen to me!
Estupidez vs. Tontería
Related Translations
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