Used and loved by millions
Since I tried Ludwig back in 2017, I have been constantly using it in both editing and translation. Ever since, I suggest it to my translators at ProSciEditing.

Justyna Jupowicz-Kozak
CEO of Professional Science Editing for Scientists @ prosciediting.com
not functional
Grammar usage guide and real-world examplesUSAGE SUMMARY
The phrase "not functional" is correct and usable in written English. You can use it to describe something that is not working or not serving its intended purpose. For example, "The printer is not functional at the moment." Alternative expressions include "non-operational," "out of order," and "inoperative."
✓ Grammatically correct
News & Media
Science
Table of contents
Usage summary
Human-verified examples
Expert writing tips
Linguistic context
Ludwig's wrap-up
Alternative expressions
FAQs
Human-verified examples from authoritative sources
Exact Expressions
59 human-written examples
She's not functional.
News & Media
Almost not functional.
News & Media
You're ornamental, not functional".
News & Media
"It's not functional," he said.
News & Media
"These cars are not functional," he said.
News & Media
"They're not functional," Johnson said, losing interest.
News & Media
It is not functional as a musical instrument.
News & Media
It's there as a premises but it is not functional".
News & Media
("Anything that is not functional is merely decorative," he declares).
News & Media
Of the weapons that have been collected, they say, at least 40percentt were not functional.
News & Media
He added, "It's not functional; it's a luxury item; it's a toy".
News & Media
Expert writing Tips
Best practice
When describing the state of machinery or equipment, using "not functional" is a clear and direct way to communicate that it is out of service or broken. Ensure that you provide additional context regarding the reason or expected duration of the problem.
Common error
While "not functional" is widely understood, it might be perceived as too informal in highly professional or academic writing. Consider using more formal alternatives such as "inoperative" or "non-operational" to maintain a sophisticated tone.
Source & Trust
87%
Authority and reliability
4.5/5
Expert rating
Real-world application tested
Linguistic Context
The phrase "not functional" primarily functions as an adjective phrase, modifying a noun to indicate that it is not performing its intended purpose or is not in working order. Ludwig AI confirms its grammatical correctness and usability across various contexts.
Frequent in
News & Media
37%
Science
37%
Formal & Business
8%
Less common in
Encyclopedias
0%
Wiki
0%
Reference
0%
Ludwig's WRAP-UP
In summary, the phrase "not functional" is a common and grammatically sound way to describe something that isn't working as intended. According to Ludwig AI, it enjoys frequent use across various domains, particularly in News & Media and Scientific contexts, though it maintains a neutral register suitable for both formal and informal communication. While effective, writers should consider the audience and select more formal alternatives like "inoperative" or "non-operational" in professional settings.
More alternative expressions(10)
Phrases that express similar concepts, ordered by semantic similarity:
out of order
Focuses specifically on a temporary state of being unusable, often due to a malfunction.
inoperative
Emphasizes a complete inability to operate, suggesting a more permanent state.
non-operational
A more formal way to say something isn't working, often used in technical contexts.
broken down
Implies something was once functional but has since ceased to work.
defective
Suggests a flaw or imperfection is causing the lack of functionality.
unserviceable
Indicates something is beyond repair or no longer fit for use.
impaired
Highlights a reduced or diminished ability to function correctly.
useless
Emphasizes the lack of value or purpose due to the inability to function.
unfit for purpose
Highlights that something is not suitable for its intended job
kaput
Informal term indicating something has completely ceased functioning
FAQs
What are some synonyms for "not functional"?
Alternatives include "out of order", "inoperative", "non-operational", or "broken down" depending on the specific context.
Is "not functional" grammatically correct?
Yes, "not functional" is grammatically correct and widely used in both spoken and written English to describe something that is not working or serving its intended purpose.
How can I use "not functional" in a sentence?
You can use "not functional" to describe various objects, systems, or even abstract concepts that are not working as expected. For example: "The printer is "not functional"" or "The committee is "not functional" due to internal conflicts."
What's the difference between "not functional" and "dysfunctional"?
"Not functional" simply means something isn't working. "Dysfunctional" implies that something is not only not working but is also working in a way that is actively harmful or detrimental. A broken machine is "not functional", while a family with severe communication problems might be described as dysfunctional.
Editing plus AI, all in one place.
Stop switching between tools. Your AI writing partner for everything—polishing proposals, crafting emails, finding the right tone.
Table of contents
Usage summary
Human-verified examples
Expert writing tips
Linguistic context
Ludwig's wrap-up
Alternative expressions
FAQs
Source & Trust
87%
Authority and reliability
4.5/5
Expert rating
Real-world application tested