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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
this is a fallacy
Grammar usage guide and real-world examplesUSAGE SUMMARY
The phrase "this is a fallacy" is correct and usable in written English.
You can use it when identifying or pointing out a logical error in an argument or reasoning. Example: "The argument presented is flawed because this is a fallacy that undermines its validity."
✓ Grammatically correct
News & Media
Science
Encyclopedias
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
16 human-written examples
This is a fallacy.
News & Media
"This is a fallacy," he said.
News & Media
The examples of Enron, WorldCom and various banks suggest this is a fallacy.
News & Media
"We think we remember exactly what happens, but research demonstrates that this is a fallacy".
News & Media
The charismatic enjoy charmed lives of premature promotions, multiple suitors and fast friends, whereas everyone else keeps their head down and hopes for the best.But this is a fallacy, says Olivia Fox Cabane, an executive charisma coach for Fortune 500 companies.
News & Media
This is a fallacy, however.
News & Media
Human-verified similar examples from authoritative sources
Similar Expressions
43 human-written examples
The McQuaid bat is straight when this is put to him: "That is a fallacy being put out there by Brian and his people, to say that I'm twisting the rules or getting the rules twisted.
News & Media
This too is a fallacy.
News & Media
But this belief is a fallacy, says Clifford S. Asness, managing principal at AQR Capital Management, a money management firm in New York.
News & Media
This, however, is a "fallacy".
Science
This definition is a fallacy since the incipient anatomic and pathophysiologic lung injury occurs with exposure and steadily progresses until sufficiently severe to become phenotypically detectable.
Expert writing Tips
Best practice
Use “this is a fallacy” to politely but firmly point out flawed reasoning without resorting to personal attacks. It maintains a focus on the argument itself, not the person making it.
Common error
Avoid overusing "this is a fallacy" as a blanket dismissal of complex arguments. Ensure your criticism is precise and addresses the specific logical flaw, not the entire idea.
Source & Trust
84%
Authority and reliability
4.5/5
Expert rating
Real-world application tested
Linguistic Context
The phrase "this is a fallacy" functions as a statement used to identify and point out a logical error or flaw in an argument or reasoning. As Ludwig AI confirms, it's a valid way to express disagreement with flawed logic.
Frequent in
News & Media
44%
Science
30%
Encyclopedias
6%
Less common in
Wiki
2%
Formal & Business
0%
Social Media
0%
Ludwig's WRAP-UP
In summary, the phrase "this is a fallacy" is a grammatically correct and commonly used statement to identify logical errors in arguments. As Ludwig AI confirms, its usage spans various contexts, from news and media to scientific discussions. While versatile, it's important to use it precisely, specifying the flawed reasoning to avoid overgeneralization. Alternatives such as "this is incorrect" or "this is based on faulty logic" can be used depending on the context. The phrase is generally neutral in register, making it appropriate for a wide range of discussions where logical accuracy is important.
More alternative expressions(6)
Phrases that express similar concepts, ordered by semantic similarity:
this represents an error in reasoning
Replaces "fallacy" with a more descriptive phrase about flawed reasoning.
this is based on faulty logic
Focuses on the logical flaw underlying the statement.
this argument is invalid
Directly states the argument's lack of validity.
this line of thinking is flawed
Highlights the flaw in the thought process.
this is a misconception
Indicates a misunderstanding or incorrect belief.
this is simply untrue
Directly states that the statement is not factual.
this is a mistaken belief
Emphasizes the incorrect nature of the belief.
this assumption is incorrect
Points out the inaccuracy of the underlying assumption.
this is not the case
A simple and direct way of saying something is not true.
the premise is false
Highlights that the foundational idea is not true.
FAQs
How can I use "this is a fallacy" in a sentence?
Use "this is a fallacy" to identify a flawed argument or incorrect reasoning. For example, "The assumption that correlation implies causation "correlation implies causation" is a classic example of a logical error; therefore, "this is a fallacy".
What are some alternatives to saying "this is a fallacy"?
You can use alternatives like "this is incorrect", "this is a misconception", or "this is based on faulty logic", depending on the specific context and type of error you're addressing.
Is it better to say "that is a fallacy" or "this is a fallacy"?
Both "that is a fallacy" and "this is a fallacy" are grammatically correct. Use "this" when referring to something you've just stated or are currently discussing. Use "that" when referring to something previously mentioned or more distant.
What does it mean when someone says "this is a fallacy of composition"?
Saying "this is a fallacy of composition" means that someone is incorrectly assuming that what is true of a part is necessarily true of the whole. It is the idea that what is true of the part is true of the whole or vice versa. /s/fallacy+of+composition.
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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
84%
Authority and reliability
4.5/5
Expert rating
Real-world application tested