How to Say "insanity" in Spanish
The most common Spanish word for “insanity” is “demencia” — use 'demencia' when you want to describe something as extremely crazy, wild, or mad in an exaggerated, informal way, like chaotic traffic or a wild party..
demencia
/deh-MEN-syah//deˈmen.sja/

Examples
¡Qué demencia tratar de cruzar la calle ahora!
What madness trying to cross the street now!
¡Conducir en esta ciudad a las cinco de la tarde es una demencia!
Driving in this city at five in the afternoon is madness!
Fue una demencia gastar todos nuestros ahorros en un solo viaje.
It was insanity to spend all our savings on a single trip.
La fiesta de anoche fue una auténtica demencia.
Last night's party was total craziness.
Describing Situations
When using 'demencia' to describe a situation, we almost always use the phrase 'es una demencia' (it's madness).
Don't use it for 'fun' crazy
Mistake: “¡Esta película es demencia!”
Correction: ¡Esta película es una locura! Use 'una locura' for fun excitement; 'demencia' usually implies something is too much to handle or totally illogical.
locura
/loh-KOO-rah//loˈkuɾa/

Examples
El diagnóstico médico confirmó la locura del paciente.
The medical diagnosis confirmed the patient's insanity.
El personaje principal cae en la locura al final de la novela.
The main character descends into madness at the end of the novel.
A veces, el estrés del trabajo me lleva al borde de la locura.
Sometimes, the stress from work brings me to the brink of madness.
Always Feminine
Like most Spanish words ending in '-ura', 'locura' is a feminine word. That means you always use 'la' or 'una' with it, as in 'la locura' (the madness) or 'una locura' (a madness).
Informal vs. Clinical Usage
Related Translations
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