Noun
an opinion formed beforehand without adequate evidence
Source: WordNetI had no preconceived idea what fame would be like, because I never thought I would be famous. I just wanted to do my work. Hell, I just wanted to pay my rent on time. Iyanla Vanzant
People in general have a preconceived idea of what prison is, from seeing documentaries or whatever. Laura Prepon
he did not even try to confirm his preconceptions Source: Internet