How to Say "diabolical" in Spanish
The Spanish word for “diabolical” is “diabólico” — B1 level.

Examples
El villano tenía un plan diabólico para destruir la ciudad.
The villain had a diabolical plan to destroy the city.
Ese rompecabezas tiene una dificultad diabólica.
That puzzle is fiendishly difficult.
Escuchamos una risa diabólica que venía del sótano.
We heard a devilish laugh coming from the basement.
Matching Gender and Number
This word must change to match what it describes. Use 'diabólico' for masculine things (el plan) and 'diabólica' for feminine things (la risa).
Emphasis through Placement
Usually, this adjective goes after the noun (e.g., 'un plan diabólico'). Putting it before the noun ('un diabólico plan') makes it sound more dramatic or poetic.
Using the Noun as a Descriptor
Mistake: “Es un plan diablo.”
Correction: Es un plan diabólico. 'Diablo' is the person (the Devil), while 'diabólico' is the word used to describe the action or quality.
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