Preconceive (verb)

1. To have an idea or opinion about something before having enough information or experience to form a valid judgement.
2. To form an idea or opinion about something before it happens or exists.

Origin:

From pre- + conceive.

Examples:

1. He preconceived the outcome of the meeting and was disappointed when it didn't go as planned.
2. She had preconceived notions about the book that prevented her from enjoying it.
3. The preconceived ideas about the class deterred him from taking it.
4. I try not to preconceive anything, I like to form my own opinions.
5. The preconceived notion that the new employee would fail turned out to be completely wrong.