How to Say "unhinged" in Spanish
The Spanish word for “unhinged” is “demente” — B1 level. This is a very common word in everyday Spanish.
English → SpanishB1
AdjectiveB1
Figurative description

Examples
La idea de escalar esa montaña sin equipo me parece demente.
The idea of climbing that mountain without equipment seems insane to me.
Su comportamiento en la reunión fue completamente demente.
His behavior in the meeting was completely mad.
Tuvieron que detener a la mujer demente.
They had to stop the insane woman.
Gender Consistency
As an adjective, 'demente' is special because it always stays the same, whether you are describing a masculine or feminine noun: 'el plan demente' (the insane plan) and 'la propuesta demente' (the insane proposal).
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