How to Say "lowlife" in Spanish
The Spanish word for “lowlife” is “escoria” — C1 level. This is a very common word in everyday Spanish.

Examples
Esa gente que roba a los pobres es la escoria de la sociedad.
Those people who steal from the poor are the scum of society.
No quiero tener nada que ver con esa escoria.
I don't want anything to do with that lowlife (or trash).
Feminine Insult
Even when you use 'escoria' to talk about a man or a mixed group, the word itself remains feminine: 'Él es una escoria' (He is scum).
Gender Misunderstanding
Mistake: “Using the word as masculine when referring to a man: 'Él es un escorio.'”
Correction: The word 'escoria' is a feminine noun regardless of the person's gender: 'Él es una escoria.' This happens because you are calling the person a 'piece of trash' (the waste material).
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