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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
secret reason
Grammar usage guide and real-world examplesUSAGE SUMMARY
The phrase "secret reason" is correct and usable in written English. You can use it when referring to a motive or explanation that is not disclosed or known to others. For example, "She had a secret reason for leaving the party early." Alternative expressions include "hidden motive" and "undisclosed reason."
✓ Grammatically correct
News & Media
Wiki
Encyclopedias
Alternative expressions(5)
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
12 human-written examples
Then you get the message that addresses your secret reason for wanting to work out.
News & Media
"Once you recognise the secret reason for her exposure, you will feel ashamed of your words & deeds," he tweeted.
News & Media
Writer met Ed after he spent many yrs. in SE Asia and asked him about Vietnam, suggesting that there must be some secret reason worth fighting for.
News & Media
Horace Gast is the gruff owner of The Pueblo Chieftain (where Bena gets a job as an unpaid society reporter), who turns out to have a secret reason for saving Bena and Ted's lives on their way to Pikes Peak.
News & Media
A question haunts this book, and it is surely the secret reason that Carrère wrote his biography of Philip K. Dick: Is Christianity just science fiction, a "branch of fantastic literature"?
News & Media
It should come as no surprise to regular readers of this column that the main reason I wanted to move -- my darkest secret reason -- was to escape the clutches of the evil GE Profile Top-Mount No-Frefrigeratorrathatthas has been menacing me for the past few years.
News & Media
Human-verified similar examples from authoritative sources
Similar Expressions
48 human-written examples
For deadly secret reasons, and in a deadly secret capacity, she wants to whack them both, because they are privy to a deadly secret.
News & Media
It suggests that there are epic forces at work, tacit collective story lines, systemic but secret reasons why we live the way we do.
News & Media
If this second approach is right, change is clearly far simpler: you need only identify and correct various thought-glitches, rather than decoding the secret reasons for your suffering.
News & Media
The fanboys would have got on the phone and Warner Brothers would have said, 'OK, we won't cast her!'" One of the "secret reasons" Jones took the job was that it meant she could hang out in London for several months, where filming took place.
News & Media
(Caroline Austen, another of Jane's nieces, recalled him this way: "Very plain in person — awkward, and even uncouth in manner — nothing but his size to recommend him — he was a fine big man — but one need not look about for secret reasons to account for a young lady's not loving him").
News & Media
Expert writing Tips
Best practice
Ensure that the context makes it clear whether the reason is secret because it is confidential (professional) or because it is deceptive (personal).
Common error
Avoid using "secret reason" when the surrounding context already implies confidentiality. For instance, "He kept the reason a secret for a secret reason" is redundant. Additionally, do not assume "secret reason" always implies wrongdoing; it can simply refer to personal privacy or strategic security.
Source & Trust
92%
Authority and reliability
4.9/5
Expert rating
Real-world application tested
Linguistic Context
The phrase "secret reason" functions primarily as a noun phrase consisting of an adjective ("secret") modifying a noun ("reason"). According to Ludwig, it often serves as the direct object of verbs like "have", "keep", or "discover", or as the subject in explanatory clauses.
Frequent in
News & Media
75%
Wiki & General Knowledge
15%
Encyclopedias
5%
Less common in
Science
3%
Formal & Business
1%
Social Media
1%
Ludwig's WRAP-UP
In summary, "secret reason" is a versatile and common noun phrase used to describe undisclosed motives across a wide variety of high-quality sources. Ludwig AI confirms its grammatical correctness and its frequent appearance in prestigious media outlets such as The New York Times and The New Yorker. While it is perfectly acceptable for general use, writers should be mindful of the nuance between a simple secret and a potentially negative "<a href="/s/ulterior+motive" target="_blank" rel="alternative">ulterior motive". Overall, it remains a powerful tool for adding depth and intrigue to both factual reporting and creative narratives.
More alternative expressions(10)
Phrases that express similar concepts, ordered by semantic similarity:
undisclosed reason
More formal and neutral, simply stating that the reason was not made public.
hidden motive
Implies a deceptive or selfish intention behind an action.
ulterior motive
Typically carries a negative connotation of having a concealed agenda.
underlying cause
Suggests a fundamental, perhaps non-obvious, explanation for a phenomenon.
private grounds
Focuses on personal or confidential justification for a decision.
covert explanation
Emphasizes the active concealment of the facts.
clandestine intent
Adds a stronger sense of secrecy or illicit activity.
veiled justification
Suggests the reason is partially obscured or disguised.
unstated objective
Focuses on the goal being hidden rather than the cause.
internal logic
Refers to a reason that is consistent within a specific, private framework.
FAQs
How do I use "secret reason" in a sentence?
You can use it as a subject or object to describe a non-disclosed motive, such as: "She had a secret reason for leaving early." Many examples in Ludwig show it used to describe political maneuvers or personal choices.
What is a more professional way to say "secret reason"?
In formal or business contexts, you might prefer "<a href="/s/undisclosed+reason" target="_blank" rel="alternative">undisclosed reason" or "<a href="/s/confidential+justification" target="_blank" rel="alternative">confidential justification".
Is "secret reason" the same as a "hidden motive"?
Not exactly. While a "secret reason" is simply one that isn't shared, a "<a href="/s/hidden+motive" target="_blank" rel="alternative">hidden motive" often implies that the person is being deceptive or has a selfish agenda.
When should I use "private reason" instead of "secret reason"?
Use "<a href="/s/private+reason" target="_blank" rel="alternative">private reason" when the emphasis is on personal boundaries and etiquette, whereas "secret reason" often implies a mystery or a piece of information actively being withheld from those who might want to know it.
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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
92%
Authority and reliability
4.9/5
Expert rating
Real-world application tested