preconceived idea

They have a preconceived idea of who should be driving that truck.

It is often said experiments must be made without a preconceived idea.

We have had economists who set out with the preconceived idea of justifying the factory system.

Yosemite Valley, contrary to most peoples' preconceived idea, lies fully 25 miles west of the Sierra crest.

It's dangerous, very dangerous, Monsieur Fred, to go from a preconceived idea to find the proofs to fit it.

Only an American art based on the hieroglyphics and war paint of the Indians would satisfy the critic with this preconceived idea.