How to Say "foolhardy" in Spanish
The Spanish word for “foolhardy” is “temerario” — B2 level.

Examples
El conductor temerario causó un accidente en la autopista.
The reckless driver caused an accident on the highway.
No seas temerario; es mejor esperar a que pase la tormenta.
Don't be foolhardy; it is better to wait for the storm to pass.
Su decisión temeraria puso en peligro a todo el equipo.
His rash decision put the entire team in danger.
Matching the Ending
Since this is an adjective, you must change the ending to match what you are describing: 'un hombre temerario' (a reckless man) but 'una mujer temeraria' (a reckless woman).
Describing People vs. Actions
You can use this word with 'ser' to describe a person's character (He is reckless) or with specific nouns like 'decisión' or 'plan' to describe a specific thing someone did.
Brave vs. Reckless
Mistake: “Using 'temerario' as a compliment for someone brave.”
Correction: Use 'valiente' for positive bravery. 'Temerario' usually implies that the person is being irresponsible or ignoring real danger.
Related Translations
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