Prejudice

n. preconceived opinion, bias; prejudgment, sentence passed before proper examination of the circumstances

v. express a preconceived opinion, express one's biases; infringe on someone's rights, injure the rights of another

In its original usage, the word prejudice referred to a prejudgmental racial statement of ill doing, or a radical evaluation or decision made before the facts of a case could be properly determined and weighed. This usage was subsequently broadened to include any unreasonable attitude that is unusually resistant to rational influence.
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Noun
1. a partiality that prevents objective consideration of an issue or situation
(synonym) bias, preconception
(hypernym) partiality, partisanship
(hyponym) taboo, tabu
(derivation) prepossess
Verb
1. disadvantage by prejudice
(hypernym) disadvantage, disfavor, disfavour
(derivation) bias, preconception
(classification) justice, judicature
2. influence (somebody's) opinion in advance
(synonym) prepossess
(hypernym) influence, act upon, work
(hyponym) bias, predetermine
(derivation) bias, preconception

n. detriment, disadvantage, disfavor; injury, harm, wrong

(n.)
To obstruct or injure by prejudices, or by previous bias of the mind; hence, generally, to hurt; to damage; to injure; to impair; as, to prejudice a good cause.
  

(n.)
To cause to have prejudice; to prepossess with opinions formed without due knowledge or examination; to bias the mind of, by hasty and incorrect notions; to give an unreasonable bent to, as to one side or the other of a cause; as, to prejudice a critic or a juryman.
  

(n.)
Mischief; hurt; damage; injury; detriment.
  

(n.)
Foresight.
  

(n.)
An opinion or judgment formed without due examination; prejudgment; a leaning toward one side of a question from other considerations than those belonging to it; an unreasonable predilection for, or objection against, anything; especially, an opinion or leaning adverse to anything, without just grounds, or before sufficient knowledge.
  

(n.)
A bias on the part of judge, juror, or witness which interferes with fairness of judgment.