What term refers to a judgment or opinion formed without knowing the facts?

The appropriate term that describes a judgment or opinion formed without knowing the facts is prejudice. Prejudice involves preconceived notions or beliefs about a person or group that are not based on actual experience or evidence. This can lead to unfounded negative attitudes or feelings toward others.

In contrast, bias refers to a preference or inclination that can influence judgment, but it may not always be negative. A stereotype simplifies or categorizes individuals based on perceived characteristics, often leading to generalizations that may not hold true. Discrimination is the behavior that results from prejudice, where individuals act on their biased beliefs, leading to unfair treatment of others.

Thus, prejudice is specifically about the unfounded judgments made without complete understanding, making it the correct choice in this context.