An adverse judgment or opinion formed beforehand or without knowledge or examination of the facts. A preconceived preference or idea. The act or state of holding unreasonable preconceived judgments or convictions. See Synonyms at predilection. Irrational suspicion or hatred of a particular group, race, or religion. Detriment or injury caused to a person by the preconceived, unfavorable conviction of another or others. To cause (someone) to judge prematurely and irrationally. See Synonyms at bias. To affect injuriously or detrimentally by a judgment or an act.