How to Say "more serious" in Spanish
The Spanish word for “more serious” is “peores” — A2 level. This is a very common word in everyday Spanish.

Examples
Estas notas son peores que las del mes pasado.
These grades are worse than last month's.
Los efectos secundarios fueron peores de lo que esperábamos.
The side effects were worse than we expected.
¿Hay noticias peores que estas?
Is there news worse than this?
Irregular Comparison
Just like 'better' and 'worse' in English, 'peor' (and its plural 'peores') is an irregular comparative form. It comes from 'malo' (bad).
No 'Más' Needed
Since 'peores' already means 'more bad,' you should never use the word 'más' (more) before it. Say 'peores,' not 'más peores'!
Using 'Más' Redundantly
Mistake: “Los más peores problemas...”
Correction: Los peores problemas... (The worst problems...)
Related Translations
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