How to Say "murderous" in Spanish
The most common Spanish word for “murderous” is “asesino” — use 'asesino' when describing a quality, intention, or characteristic that is inherently murderous or killer-like, often in a more figurative or intense sense..
asesino
/a-se-SI-no//aseˈsino/

Examples
El boxeador tiene un instinto asesino en el ring.
The boxer has a killer instinct in the ring.
Me lanzó una mirada asesina cuando derramé el café.
She shot me a murderous look when I spilled the coffee.
El gas tiene un efecto asesino si se inhala.
The gas has a deadly effect if inhaled.
Matching the Noun
When used to describe something, 'asesino' must match the gender and number of that thing. For example: 'un instinto asesino' (a killer instinct) but 'una mirada asesina' (a murderous look), because 'mirada' is feminine.
homicida
/oh-mee-SEE-dah//omiˈθiða/

Examples
Encontraron el arma homicida en el jardín.
They found the murder weapon in the garden.
Tenía una mirada homicida.
He had a murderous look in his eyes.
Matching the Noun
Even as an adjective, it ends in -a for both masculine and feminine nouns. Example: 'el ataque homicida' and 'la bala homicida'.
Asesino vs. Homicida
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