How to Say "madman" in Spanish
The most common Spanish word for “madman” is “loco” — use 'loco' when referring to someone acting irrationally or behaving in a wild, uncontrolled manner, often in an informal or colloquial context. It can also be used to describe someone who is genuinely mentally ill, but with a stronger, more negative tone than 'demente'.
loco
LOH-kohˈlo.ko

Examples
Ese hombre está completamente loco.
That man is completely mad.
No le hagas caso a ese loco.
Don't pay attention to that crazy person.
Solo un loco conduciría con esta tormenta.
Only a madman would drive in this storm.
¡Qué hacés, loco! ¿Todo bien?
What's up, man! All good?
Feminine and Plural Forms
Just like the adjective, the noun form also changes. A female crazy person is a 'loca'. A group of them would be 'locos' (all male or mixed group) or 'locas' (all female).
demente
deh-MEN-tehdeˈmente

Examples
El demente fue trasladado a un centro de tratamiento.
The madman was transferred to a treatment center.
El demente escapó del hospital psiquiátrico.
The madman escaped from the psychiatric hospital.
La demente fue detenida después de causar destrozos.
The lunatic (female) was detained after causing damage.
Referring to People
When 'demente' is used as a noun, it refers to the person. You must use the correct article ('el' for a man, 'la' for a woman) even though the word 'demente' itself doesn't change: 'el demente' / 'la demente'.
lunático
Examples
Mi vecino es un lunático, siempre sale a correr a las tres de la mañana.
My neighbor is a lunatic, he always goes for a run at three in the morning.
perturbado
per-toor-BAH-thopeɾtuɾˈβaðo

Examples
La policía está buscando a un perturbado que causó disturbios.
The police are looking for a disturbed person who caused disturbances.
La policía detuvo a un perturbado que amenazaba a los peatones.
The police detained a disturbed man who was threatening pedestrians.
Turning Adjectives into Nouns
In Spanish, you can put 'un' or 'el' in front of many adjectives like 'perturbado' to talk about 'a person who is...'
Sensitivity Note
Mistake: “Using this word lightly.”
Correction: Be careful; calling someone 'un perturbado' is quite strong and can be seen as an insult or a very serious medical claim.
Choosing between 'loco' and 'demente'
Related Translations
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