Looking up...
bad, wrong, or poorly done
Este trabajo está mal hecho.
This work is poorly done.
ill, sick, or unwell
Me siento mal hoy.
I'm feeling unwell today.
evil, wrong, or morally bad
El mal triunfa cuando el bien no hace nada.
Evil triumphs when good does nothing.
The meaning of 'mal' can change significantly depending on the context.
From Old Spanish 'mal', from Latin 'malus'.
Be careful with the different meanings and uses of 'mal'.