preconception
prepossession
parti pris
preconceived opinion
preconceived idea
preconceived notion

But there is no preconceived idea of what we will do.

He's already got the preconceived idea that she's gone away with someone.

But they had no preconceived ideas about how the house should look.

It was easier to fall back on old preconceived ideas.

They don't come with a preconceived idea of how French fashion should be.

Some people come with preconceived ideas about what a classical play should be.

You don't fit into their preconceived ideas about how a woman should act.

The majority must be prepared to understand the reality of the situation without preconceived ideas.

The curtain goes up, and you should have no preconceived idea.

"Because you won't let me get past your preconceived ideas of what a vampire should be."