The word creíais is the imperfect form of creer in the second person plural.
See the full creer conjugation

creer

¿No creíais que sería lo suficiente mujer como para esperar?
Wouldn't you think she'd be woman enough to hang on?
Pero todos creíais que nuestro nombre era genial.
But you all thought our name was sweet.
¿Por qué creíais que se llamaba Perk?
Why did you think he was called Perk?
No me creíais, así que conseguí pruebas.
None of you believed me, so I got proof.
¿Qué creíais que hacías ahí fuera?
And what do you think you were doing out there?
No me creíais, así que conseguí pruebas.
None of you believed me, so I got proof.
Muy bien, ahora, si creíais que la alfombra era mala, mirad esto.
All right, now, you thought the carpet was bad, have a look at this.
¿No creíais que pudiéramos hacerlo, no?
Didn't think we could make it, did you?
¿De verdad creíais que simplemente iba a dejaros marchar?
Did you really think I was going to let you just walk away?
¿Qué creíais que iba a pasar?
What'd you think we were gonna do?
¿A qué creíais que estabais jugando?
So, what do you two think you're playing at?
¿Qué creíais que estaba haciendo?
What'd you think I was doing?
Pero vamos, ¿de verdad creíais que dejaría que se lo llevaran?
But come on, did you really think I would let them get away with it?
¿Qué creíais que podía pasar?
What did you think was going to happen?
¿Qué creíais que estaba haciendo?
What'd you think I was doing?
Pero vamos, ¿de verdad creíais que dejaría que se lo llevaran?
But come on, did you really think I would let them get away with it?
Mira, no me creíais.
Look, you didn't believe me.
No creíais que pudiera conseguirlo.
Didn't think I could do it.
Hasta hace poco habéis estado tan aislados que en realidad os creíais en el centro del Universo.
Until recently you had been kept so isolated that you really did believe that you were at the centre of the Universe.
¿Creíais que nos ibais a llevar de paseo?
You think you're gonna take us for a ride?
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