What does reasonableness mean?
Reasonableness is the quality of being fair, sensible, and justifiable through sound reasoning. It is commonly used to evaluate decisions, proposals, judgments, and actions, as in a discussion of “the reasonableness of” a policy or request. In everyday use, the word suggests that a person is acting without exaggeration, prejudice, or unfairness, although it can also describe the practical limits of what someone should reasonably be expected to do. The term frequently appears in legal and public debate, where reasonableness helps distinguish proportionate conduct from arbitrary or excessive action. It is closely related to fairness and sound judgment, but it is not identical to rationality: reasonableness includes social and practical considerations as well as logical consistency. As a noun, it provides a formal way to discuss the basis and fairness of conduct.
nounThe quality of being reasonable, especially the quality of being fair, sensible, and capable of being justified by reason. It can also refer to the degree to which an action, decision, or belief is reasonable.
- The quality of being fair, sensible, and justifiable.
- The quality of a particular action, decision, or belief being consistent with reason or good judgment.
"The committee questioned the reasonableness of the proposal before approving it."
"The judge considered the reasonableness of the sentence in light of the circumstances."
"She explained the reasonableness of changing the schedule before agreeing to the new timetable."
The plural is uncommon and generally used when referring to separate instances of being reasonable.
"The report compared the reasonablenesses of several different planning proposals."
Reasonableness is the idea that good judgment should be capable of standing up to an honest examination of reasons.
Reviewed by Deb Chak, Editor. AI-assisted content curated by RJS Tech Solutions LLP.
Where does reasonableness come from?
The word derives from “reasonable,” which comes from “reason” and the suffix “-able,” meaning “able to be reasoned about” or “capable of being justified by reason.” The underlying root is Latin ratione, an ablative form of ratio, meaning “reason” or “account.” Related English words include “rational,” “rationale,” “rationality,” and “ration,” all of which reflect the same Latin foundation.
Related word forms
How reasonableness is actually used
The noun is more formal than the adjective “reasonable” and is often used in legal, institutional, or argumentative contexts. It can refer broadly to fair judgment or specifically to whether a decision can be justified.
Easily confused with reasonableness
Reasonableness usually describes whether conduct or judgment is fair and sensible, whereas rationality more specifically concerns being guided by reason or logic.