What does nonfunctional mean?
Nonfunctional means that something is not working or is unable to perform the function for which it was designed. It is especially common in technical and professional contexts involving equipment, software, machines, systems, and electronic or mechanical components. A nonfunctional device might be damaged, disconnected, incorrectly configured, or otherwise incapable of normal operation. The word is more precise than a general description such as “broken,” because it focuses specifically on the absence of the expected function rather than necessarily describing physical damage. It can also appear before a noun, as in “nonfunctional equipment,” or function as a predicate adjective, as in “the system is nonfunctional.” Although “dysfunctional” is sometimes used similarly, nonfunctional normally suggests a complete failure to operate, whereas dysfunctional may describe impaired or abnormal functioning.
adjectiveNot functioning or working; inoperative or incapable of performing its intended function.
- Not functioning, operating, or working as intended.
"The device remained nonfunctional despite several attempts to restart it."
"The old radio was nonfunctional and could not be repaired."
"Engineers replaced the nonfunctional sensor before the flight."
A system can be present and visibly intact while still being nonfunctional, which is why testing matters more than appearance in technical work.
Reviewed by Deb Chak, Editor. AI-assisted content curated by RJS Tech Solutions LLP.
Where does nonfunctional come from?
The word combines the productive prefix non-, meaning “not,” with functional, an adjective derived from function. “Function” comes from Latin functio, a “performance” or “execution,” from the Latin verb fungi, “to perform” or “execute.” The negative form nonfunctional developed in the 20th century as a technical descriptor for equipment or systems that do not operate as intended.
Related word forms
How nonfunctional is actually used
This is a formal and technical term, especially common in engineering, computing, medicine, and equipment maintenance. It is often used attributively before nouns such as “equipment,” “device,” and “system,” but it can also follow a subject as a predicate adjective.
Easily confused with nonfunctional
Nonfunctional means completely unable to perform its intended function, whereas dysfunctional often means functioning poorly or in an abnormal way.