How to Say "evil-doers" in Spanish
The Spanish word for “evil-doers” is “monstruos” — B1 level.
English → SpanishB1
nounB1
People who commit evil acts

Examples
Esos criminales son unos monstruos, no tienen corazón.
Those criminals are fiends; they have no heart.
Los monstruos de la guerra causaron un daño irreparable.
The monsters of war caused irreparable damage.
Figurative Use
This meaning uses the idea of a physical monster to describe someone's terrible character or actions. It's a very strong insult.
Learn Spanish with Inklingo
Interactive stories, personalized learning, and more.