What does uncertainty mean?
Uncertainty names the condition in which a fact, meaning, prediction, or decision is not known with confidence. It is common in discussions of science, finance, politics, education, and everyday planning, where incomplete information or unpredictable conditions make firm conclusions difficult. The word can describe a particular question, such as uncertainty about an exam result, or a wider atmosphere, such as uncertainty in the labor market. Unlike ignorance, which suggests a lack of knowledge, uncertainty often emphasizes the limits of what can reliably be known, even when relevant evidence has been carefully considered. It can also refer to ambiguity or a lack of precision in language and interpretation. Because certainty is often presented as a desirable goal, uncertainty can imply risk, instability, or caution, but in scientific and philosophical contexts it is also an important and legitimate description of reality. Understanding the word helps distinguish informed openness from careless doubt and recognizes that responsible decisions can often be made without complete certainty.
nounThe state of not being certain, especially when a fact, outcome, or course of action is unknown or difficult to determine. It can also refer to a specific condition or situation whose nature or result cannot be predicted with confidence.
- The condition of not knowing a fact, outcome, or course of action with confidence.
- A lack of precision or definiteness in meaning, interpretation, or circumstances.
"The uncertainty surrounding the negotiations made it difficult for investors to make decisions."
"There is some uncertainty about whether the project will be completed on time."
"The report acknowledges the uncertainty inherent in long-term economic forecasts."
Use the plural when referring to multiple unresolved facts, risks, or sources of doubt.
"The project was delayed by several uncertainties about funding and delivery."
Uncertainty is not merely ignorance; it is the precise name for the boundary of what knowledge can establish.
Reviewed by Deb Chak, Editor. AI-assisted content curated by RJS Tech Solutions LLP.
Where does uncertainty come from?
Uncertainty developed in Middle English from Old French incertain, meaning uncertain or not fixed. The French word was borrowed from Latin incertus, formed from in-, meaning not, and certus, meaning sure or determined. The related English words certainty, certainly, certify, and ascertain share the Latin root certus, while the contrasting form uncertain also comes through Old French.
How uncertainty is actually used
The word is neutral in register and can describe both specific unresolved questions and broader social, scientific, or economic conditions. It is often more formal than simply saying that something is unknown, and it carries a measured tone rather than suggesting panic or confusion.
Easily confused with uncertainty
Ambiguity refers to a word, statement, or situation that permits more than one interpretation, whereas uncertainty is the general condition of not knowing what is true or what will happen.
Uncertainty is the state of being unable to determine something confidently, while insecurity more specifically suggests a lack of safety, stability, or protection.