preconception

An opinion or conception formed in advance of adequate knowledge or experience, especially a prejudice or bias.

A conception or opinion formed in advance of experience or actual knowledge; also, the influence of previous belief or states of mind in modifying the conceptions formed under the partial influence of experience.

The act of preconceiving; conception or opinion previously formed.

An opinion formed before obtaining adequate evidence, especially as the result of bias or prejudice.

A prejudice that prevents rational consideration of an issue.

an opinion formed beforehand without adequate evidence

a partiality that prevents objective consideration of an issue or situation