such a thing
No hay tal cosa como un zorro ingenuo, ni un hombre sin defectos.
There is no such thing as a naive fox, nor a man without flaws.
No me atrevo a decirle tal cosa.
I don't dare tell him/her such a thing.
Ella no puede haber hecho tal cosa.
She couldn't have done such a thing.
Solo un esclavo diría tal cosa.
Only a slave would say such a thing.
¿Crees que tal cosa es posible?
Do you think something like that is possible?