What does unbiased mean?
Unbiased describes a person, process, or judgment that is not influenced by prejudice, favoritism, or a one-sided interest. In ordinary use, the word suggests impartiality: the person or institution is expected to weigh evidence fairly and avoid giving one side an automatic advantage. It is common in formal contexts such as news reporting, research, elections, mediation, and assessments, where the credibility of a decision can depend on the absence of a systematic tilt. The adjective can also have a technical statistical sense, describing a quantity or estimate whose expected value is the true value rather than a value systematically shifted in one direction. Saying that someone is unbiased does not guarantee that their judgment is perfect, only that no relevant bias should influence it. The word is especially useful because it names a standard of fairness that can be assessed and challenged. Its ordinary connotation is positive but demanding: an unbiased observer is expected to be impartial, alert to their own assumptions, and willing to consider contrary evidence.
adjectiveFree from bias or prejudice; impartial and fair in judgment, treatment, or presentation.
- Impartial and fair, without favoritism, prejudice, or a one-sided interest.
- Free from systematic bias in measurement or estimation, especially in statistics.
"The panel worked to reach an unbiased decision after reviewing all of the evidence."
"The judge was careful to remain unbiased throughout the lengthy trial."
"The researchers designed an unbiased sample to represent the wider population."
Calling someone unbiased does not mean they lack a viewpoint; it means their conclusions should not be predetermined by a hidden tilt.
Reviewed by Deb Chak, Editor. AI-assisted content curated by RJS Tech Solutions LLP.
Where does unbiased come from?
The word was formed in English from the prefix un-, meaning “not,” and the adjective biased, meaning marked by prejudice or an unfair inclination. Both elements were in use during the early modern English period, when unbiased was already appearing in English writing. Bias ultimately comes through French from Italian bias, “prejudice” or “partiality,” from the Latin word for “askew” or “slanting.”
Related word forms
How unbiased is actually used
Formal and widely used in contexts involving judgment, reporting, research, and assessment. It is generally positive, although it expresses a standard of fairness rather than guaranteeing that a decision is correct.