The adjective that means “exhibited or characterized by an unreasoned judgment” is biased (“a biased news story”). There is an adjective bias, but it means “diagonal” and is used only of fabrics (“a bias …

A biased collection of data contains more information that supports a particular opinion than you would expect to find if the collection had been made by chance:

BIASED definition: having or showing bias or prejudice. See examples of biased used in a sentence.

Definition of biased adjective from the Oxford Advanced Learner's Dictionary. tending to show favour towards or against one group of people or one opinion for personal reasons; making unfair judgements.

While biased can just mean having a preference for one thing over another, it also is synonymous with "prejudiced," and that prejudice can be taken to the extreme.

Define biased. biased synonyms, biased pronunciation, biased translation, English dictionary definition of biased. also bi·assed adj. Marked by or exhibiting bias; prejudiced: gave a biased account of the trial.

If someone is biased, they prefer one group of people to another, and behave unfairly as a result. You can also say that a process or system is biased.

WordReference Random House Learner's Dictionary of American English © 2026 bi•ased /ˈbaɪəst/ adj. having or showing bias: handed in a biased report. Also, esp. Brit., ˈbi•assed.

Media bias occurs when journalists and news producers present factual bias in how they report and convey news, current events, dialogue, or opinions. The term "media bias" implies a pervasive or …

Biased definition: Marked by or exhibiting bias; prejudiced.