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

Examples
La comida en ese hotel era pésima.
The food at that hotel was awful.
Tuve un día pésimo en el trabajo.
I had a terrible day at work.
El servicio al cliente es pésimo.
The customer service is dreadful.
Matching the Noun
This word changes its ending to match what you are talking about: use 'pésimo' for masculine things (un actor pésimo) and 'pésima' for feminine things (una película pésima).
Already at the Maximum
This word already means 'extremely bad.' Because it's already so strong, you don't usually put 'muy' (very) in front of it.
Avoid 'Muy Pésimo'
Mistake: “La película fue muy pésima.”
Correction: La película fue pésima. (Since the word already means 'extremely bad,' adding 'very' is like saying 'very worst.')
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