How to Say "trust" in Spanish
The most common Spanish word for “trust” is “confianza” — use this word to express general confidence or assurance in a person, a system, a plan, or a relationship..
confianza
kon-fyan-sa/komˈfjan.sa/

Examples
Tengo mucha confianza en que el proyecto saldrá bien.
I have a lot of confidence that the project will turn out well.
Ella es una persona de mi entera confianza; puedes contarle el secreto.
She is a person I entirely trust; you can tell her the secret.
Si quieres hablar en público, tienes que ganar confianza.
If you want to speak in public, you have to gain confidence.
Which Preposition to Use?
To express who or what you trust in, use the preposition 'en': 'Tengo confianza en ti' (I have confidence in you).
Using the wrong preposition
Mistake: “Poner confianza *a* alguien.”
Correction: Poner confianza *en* alguien. The preposition 'en' (in) is required after 'confianza' when stating the object of your trust.
confía
Examples
Ella confía en que todo saldrá bien.
She trusts that everything will turn out well.
fe
/fay/ (rhymes with the English word 'day')/fe/

Examples
Tengo fe en que encontraremos una solución pronto.
I have faith (or trust) that we will find a solution soon.
Mi abuela es una persona de mucha fe y va a misa todos los domingos.
My grandmother is a person of great faith and goes to mass every Sunday.
Perdió la fe en el sistema después del escándalo.
He lost trust in the system after the scandal.
A Short Feminine Noun
Even though 'fe' is very short and doesn't end in '-a', it is a feminine noun. You must always use 'la' with it, as in 'la fe'.
Using the Wrong Article
Mistake: “El fe.”
Correction: La fe. (Remember 'fe' is feminine, even if it doesn't sound like it!)
confíe
Examples
Espero que ella confíe en mi palabra.
I hope that she trusts my word.
déjate
Examples
Déjate llevar por el momento.
Let yourself be carried away by the moment (go with the flow).
crédito
Examples
Su testimonio perdió todo crédito después de que se descubrieron las mentiras.
His testimony lost all credibility after the lies were discovered.
fianza
fee-AHN-sah (Latin America) / fee-AHN-thah (Spain)/ˈfjan.sa/

Examples
Su palabra es mi fianza de que cumplirá el contrato.
His word is my guarantee that he will fulfill the contract.
Le di mi fianza al proyecto, confiando en su éxito.
I gave my assurance to the project, trusting in its success.
cartel
/kar-TEL//kaɾˈtel/

Examples
Las empresas fueron multadas por formar un cartel para fijar los precios.
The companies were fined for forming a cartel to fix prices.
El estudio demostró la existencia de un cartel en el sector energético.
The study proved the existence of a cartel in the energy sector.
Confianza vs. Fe
Related Translations
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