How to Say "foolishness" in Spanish
The most common Spanish word for “foolishness” is “estupidez” — use this for a general lack of sense, intelligence, or good judgment, often implying a more significant or frustrating absence of reason.
estupidez
es-too-pee-DESestuˈpiðeθ

Examples
No puedo creer la estupidez que dijo en la reunión.
I can't believe the foolish remark (or stupid thing) 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'.
idiotez
ee-dee-oh-tessi.ðjoˈteθ

Examples
¡Qué idiotez acabo de hacer!
What a stupid thing (or foolish act) I just did!
No perdamos el tiempo con esa idiotez.
Let's not waste time with that nonsense.
Me da rabia haber fallado por una idiotez.
It makes me angry to have failed because of something so stupid.
Spelling Change in Plural
When you have more than one 'idiotez,' the 'z' at the end changes to a 'c' before adding '-es'. So, it becomes 'idioteces'.
Using 'Una' for Actions
In Spanish, we often say 'una idiotez' (a stupidity) to refer to a single specific action or remark, whereas in English we'd more likely say 'a stupid thing'.
Person vs. Action
Mistake: “Eres una idiotez.”
Correction: Eres un idiota.
tontería
Examples
¡Deja de decir tonterías y escúchame!
Stop talking nonsense (or silly things) and listen to me!
Estupidez vs. Tontería
Related Translations
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