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 …

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:

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 …

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 …

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.

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.

adjective having or showing bias or prejudice. They gave us a biased report on immigration trends.

biased, adj. meanings, etymology, pronunciation and more in the Oxford English Dictionary

Synonyms for BIASED: partial, hostile, distorted, partisan, prejudiced, colored, one-sided, influenced; Antonyms of BIASED: neutral, impartial, unbiased, objective, disinterested, fair, …

WordReference Random House Unabridged Dictionary of American English © 2025 bi•ased (bī′ əst), adj. having or showing bias or prejudice: They gave us a biased report on immigration …