falso

Esa información resultó ser completamente falsa.

That information turned out to be completely false.

Le pillaron usando un billete falso.

They caught him using a fake banknote.

Su sonrisa parecía falsa, no me fié de él.

His smile seemed fake, I did not trust him.

Es una falsa alarma, no ha pasado nada.

It is a false alarm, nothing has happened.

No quiero dar una impresión falsa de la empresa.

I do not want to give a false impression of the company.