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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 all there
Grammar usage guide and real-world examplesUSAGE SUMMARY
The phrase 'not all there' is correct and usable in written English.
You can use it when referring to someone that is not mentally focused or appears distracted. For example, "My colleague's been behaving strangely lately, he's not all there."
✓ Grammatically correct
News & Media
Academia
Science
Wiki
Alternative expressions(6)
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
58 human-written examples
"He's still not all there," Minaya said.
News & Media
But that's not all there is to archaeology.
Academia
But that's not all there is to it.
News & Media
But that is not all there is to it.
News & Media
But that's not all there is to worry about.
News & Media
But that is not all there is to the subject.
News & Media
Of course, that was not all there was to it.
News & Media
But that is not all there is in economics.
News & Media
However, this is not all there is to the novel.
News & Media
Human-verified similar examples from authoritative sources
Similar Expressions
2 human-written examples
But that's not all there is to multi-tasker Zankoul.
News & Media
That's not all there was to him, but it's part of it.
News & Media
Expert writing Tips
Best practice
Distinguish between the idiomatic sense (mental state) and the literal sense (completeness). Use it to describe complexity in an argument by saying "that is not all there is to it".
Common error
When writing scientific or technical papers, avoid using the idiomatic sense of "not all there" to describe data. Instead, use precise terms like "incomplete" or "deficient" to prevent readers from interpreting it as a comment on someone's mental health.
Source & Trust
93%
Authority and reliability
4.8/5
Expert rating
Real-world application tested
Linguistic Context
The phrase "not all there" primarily functions as a predicative adjective phrase. In its idiomatic form, it describes a subject's state of mind, while in its literal form, it often appears as part of a longer construction like "not all there is". Ludwig AI confirms its grammatical validity in both news and academic contexts.
Frequent in
News & Media
65%
Academia
15%
Wiki
10%
Less common in
Science
5%
Encyclopedias
3%
Professional
2%
Ludwig's WRAP-UP
In conclusion, "not all there" is a highly flexible English phrase that serves two distinct purposes. Idiomatically, it describes a person who is distracted or mentally impaired, a usage frequently found in narrative journalism and literature. Literally, it is often part of the phrase "not all there is to it", which functions as a rhetorical device to indicate that a subject has more depth or complexity. Ludwig AI indicates that while the phrase is grammatically correct and widely used in prestigious media, writers should be mindful of its informal tone when describing individuals and opt for more precise terms in technical documentation.
More alternative expressions(10)
Phrases that express similar concepts, ordered by semantic similarity:
Not all there is to it
Extends the phrase to specify that a situation has more layers or hidden details
Mentally absent
A more clinical or formal way to describe someone who is not focused or present
Not quite right
A broader idiomatic expression describing something that feels off or incomplete
Incomplete
The literal alternative when referring to data, objects, or arguments
Out of it
More informal and often refers to temporary confusion or intoxication
Not playing with a full deck
A much more colorful and highly informal idiom with the same mental connotation
Insufficient
Used in formal contexts to replace the literal meaning of being not all present
A few bricks short of a load
Slang idiom used to describe mental deficiency or eccentricity
Absent-minded
Focuses specifically on forgetfulness rather than general mental state
Lacking
A direct verb-based alternative for the literal sense of missing components
FAQs
What does it mean when someone is "not all there"?
In an idiomatic sense, it means that a person seems mentally confused, distracted, or lacking full cognitive awareness. As noted in Ludwig, it can also literally mean that something is "incomplete".
Is it polite to say someone is "not all there"?
No, it is generally considered an informal and potentially derogatory way to describe someone's mental state. In professional settings, it is better to use "distracted" or "disoriented".
How do I use "not all there" in a sentence about a situation?
You can use it to suggest that a simple explanation is insufficient by saying, "That is "not all there is to it"", which implies there are further details to consider.
What is a more formal alternative to "not all there"?
If you are referring to a lack of components, use "insufficient". If referring to mental state, use "mentally preoccupied".
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Table of contents
Usage summary
Human-verified examples
Expert writing tips
Linguistic context
Ludwig's wrap-up
Alternative expressions
FAQs
Source & Trust
93%
Authority and reliability
4.8/5
Expert rating
Real-world application tested