How to Say "hilarious" in Spanish
The Spanish word for “hilarious” is “mortal” — C1 level. This is a very common word in everyday Spanish.
English → SpanishC1
adjectiveC1informal
very funny (especially Spain)

Examples
El chiste que contó fue mortal, lloré de la risa.
The joke he told was hilarious, I cried laughing.
La subida a la montaña estuvo mortal, casi no llego.
The climb up the mountain was brutal, I almost didn't make it.
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