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
that's false
Grammar usage guide and real-world examplesUSAGE SUMMARY
The phrase "that's false" is correct and usable in written English.
You can use it to indicate that a statement or claim is not true or accurate. Example: "The assertion that the Earth is flat is simply not supported by evidence; that's false."
✓ Grammatically correct
News & Media
Science
Wiki
Alternative expressions(3)
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
60 human-written examples
It's a reaction to what they perceive as Romney's synthetic and calculating persona, the sense that he somehow embodies everything that's false and impenetrable about the parties in Washington.
News & Media
"What's the 10percentthatat's false?" I ask.
News & Media
And so there is no understanding of the diaspora Zionism didn't want it and that's false.
News & Media
The garish surroundings emphasise everything that's false about their marriage, and the effect is at once excruciating and horribly funny.
News & Media
As for his tax returns, Mr. Spitzer — who has allowed members of the news media to view two years of returns at his office — said, "Scott, our first debate, you said the same thing about not having released tax returns, and I said, 'No, that's false, come look at them.' You haven't shown up".
News & Media
There is a proposition that Tail is part of Tibbles on Monday morning (that's true) and that Tail is part of Tibbles on Monday afternoon (that's false), but no proposition involving just the parthood relation and two objects.
Science
In terms of how we notify Pages when they share information that's false, any time any Page or individual shares a link that has been rated false by fact-checkers, if we already have a false rating we warn them before they share, and if we get a false rating after they share, we send them a notification.
News & Media
(Footnote – of course, that's false).
News & Media
In reality, that's false; silicone isn't necessarily going to strengthen your hair, but instead tame your frizziness and give the hair a healthier and sleeker appearance.
Wiki
"In today's world, people know one thing about banks: They say, O.K., they're not lending, so they assume that no one's lending, and that's false," Mr. Quintero said.
News & Media
Fuller & Thaler's results suggest that's false.
News & Media
Expert writing Tips
Best practice
Consider the context and audience when using "that's false"; in formal settings, more nuanced language might be appropriate, such as "that is not entirely accurate".
Common error
Avoid simply stating "that's false" without providing any supporting evidence or explanation. This can come across as dismissive and unconvincing. Always follow up with a reason why the statement is incorrect.
Source & Trust
87%
Authority and reliability
4.5/5
Expert rating
Real-world application tested
Linguistic Context
The phrase "that's false" functions as an interjection or declarative statement used to express disagreement or contradiction. It directly negates a previously stated claim, asserting its untruth. Ludwig's examples show its common usage in rebuttals and fact-checking.
Frequent in
News & Media
65%
Science
15%
Wiki
10%
Less common in
Formal & Business
5%
Encyclopedias
3%
Reference
2%
Ludwig's WRAP-UP
In summary, "that's false" is a commonly used phrase for directly contradicting a statement. Ludwig AI confirms its grammatical correctness and widespread use across various contexts, particularly in News & Media. While it is generally appropriate for neutral settings, careful consideration should be given to the audience and formality of the situation, with alternatives like "that's incorrect" or "that's not entirely accurate" considered for more formal or professional communication. Always provide evidence to support claims of falsehood to enhance credibility.
More alternative expressions(10)
Phrases that express similar concepts, ordered by semantic similarity:
that's not true
Uses "not true" instead of "false" to convey the same meaning.
that's incorrect
Replaces "false" with "incorrect", indicating inaccuracy.
that's a lie
More direct and forceful, accusing someone of dishonesty.
that's a falsehood
More formal and emphatic than "that's false".
that's simply not the case
Offers a more elaborate way of denying a statement.
that's inaccurate
Similar to "that's incorrect", but emphasizes a lack of precision.
that's not the reality
Emphasizes that a statement doesn't align with actual circumstances.
that's erroneous
A formal synonym for "that's false".
that is unfounded
Implies there is no basis or evidence for the claim.
that's a misrepresentation
Suggests the statement is a distorted or inaccurate portrayal of facts.
FAQs
How can I use "that's false" in a sentence?
Use "that's false" to directly contradict a statement you believe to be untrue. For instance, "The claim that all vaccines cause autism? "That's false", and has been widely debunked."
What are some alternatives to saying "that's false"?
You can use alternatives like "that's not true", "that's incorrect", or "that's a lie" depending on the context and the level of formality required.
Is it always appropriate to use "that's false" in professional communication?
While "that's false" is direct and clear, it may be too blunt for some professional contexts. Consider softening your language with phrases like "that's not entirely accurate" or "that requires some clarification" in sensitive situations.
How do I effectively use "that's false" in an argument?
When using "that's false" in an argument, always provide supporting evidence or reasoning to back up your claim. Simply stating "that's false" without any justification may weaken your argument and make you appear dismissive.
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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
87%
Authority and reliability
4.5/5
Expert rating
Real-world application tested