How to Say "faulty" in Spanish
The Spanish word for “faulty” is “fallado” — B1 level. This is a very common word in everyday Spanish.
English → SpanishB1
AdjectiveB1
defective equipment

Examples
Devolvimos el producto fallado a la tienda.
We returned the faulty product to the store.
Fue un intento fallado de reconciliación.
It was a failed attempt at reconciliation.
Ella no quiere usar la impresora fallada.
She doesn't want to use the defective printer.
Agreement is Key
When 'fallado' is used as an adjective (describing a noun), it must change its ending to match the noun it describes: 'fallado' (masc. sing.), 'fallada' (fem. sing.), 'fallados' (masc. plural), 'falladas' (fem. plural).
Related Translations
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