How to Say "sarcastic" in Spanish
The Spanish word for “sarcastic” is “irónico” — B1 level. This is a very common word in everyday Spanish.

Examples
Es irónico que un bombero tenga un incendio en su propia casa.
It is ironic that a firefighter has a fire in his own house.
Me dio una sonrisa irónica antes de irse.
He gave me an ironic smile before leaving.
Su tono era bastante irónico y no sabía si hablaba en serio.
His tone was quite sarcastic and I didn't know if he was being serious.
Matching the Noun
This word is a describing word. It changes to 'irónica' if the thing you are describing is feminine (like 'una respuesta') or 'irónicos/as' if there are more than one.
Irony vs. Sarcasm
Mistake: “Using 'sarcástico' for every strange situation.”
Correction: Use 'irónico' for situations that are weird coincidences. Use 'sarcástico' only when someone is being a bit mean or mocking on purpose.
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