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
big fat liar
Grammar usage guide and real-world examplesUSAGE SUMMARY
The phrase "big fat liar" is correct and usable in written English.
It is usually used to describe someone who is deliberately lying or deceiving someone. For example, "Roy is such a big fat liar - I can't believe anything he says."
✓ Grammatically correct
News & Media
Wiki
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
32 human-written examples
Big fat liar!
News & Media
And then came Big Fat Liar.
News & Media
Shawn Levy ("Big Fat Liar") directed.
News & Media
"He's such a big, fat liar".
News & Media
"Big Fat Liar" is rated PG (Parental guidance suggested).
News & Media
As such, they might conclude that I am, in fact, a big fat liar.
News & Media
Human-verified similar examples from authoritative sources
Similar Expressions
28 human-written examples
"I don't care that Newt has lied and that Santorum has lied and that Romney has lied, and that everybody is just a bunch of big, fat liars".
News & Media
She rails against "big fat liars" like James Frey ("A Million Little Pieces," which he claimed was only 5percentt dishonest, according to a page count) and Greg Mortenson ("Three Cups of Tea").
News & Media
Watch their noses grow and grow as they waffle on unconvincingly about it being, "the best thing I've ever done and the most satisfying creative journey I've ever undertaken blah blah blah... .. Luckily, not all musicians are big fat liars.
News & Media
"They are big, fat liars and justify their lies because they believe it is for a higher purpose".
News & Media
Egyptian President Hosni Mubarak is quoted as saying Iranian officials "are big, fat liars". The cables show the concerns many Arab nations have about Iran's nuclear program, with a number of leaders encouraging the United States to take military action if necessary to thwart it.
News & Media
Expert writing Tips
Best practice
When using the phrase "big fat liar", be mindful of the context and audience, as it can be considered offensive. Consider alternatives like "outright liar" or "complete fibber" in more formal settings.
Common error
Avoid using "big fat liar" in formal writing or professional communication. It's too informal and can damage your credibility. Opt for more neutral and professional language, such as "dishonest person" or "misleading statement".
Source & Trust
87%
Authority and reliability
4.5/5
Expert rating
Real-world application tested
Linguistic Context
The phrase "big fat liar" functions as a compound adjective modifying the noun "liar". According to Ludwig, the phrase is used to emphatically accuse someone of lying. The adjectives "big" and "fat" intensify the accusation, suggesting the lie is significant and deliberate.
Frequent in
News & Media
75%
Wiki
12%
Reference
5%
Less common in
Science
3%
Formal & Business
2%
Academia
1%
Ludwig's WRAP-UP
The phrase "big fat liar" is a common and emphatic way to accuse someone of dishonesty. Ludwig confirms that the expression is grammatically sound, although its informality and potentially offensive nature should be considered. It's frequently found in news and media contexts, often within quotations or opinion pieces. Alternatives such as "outright liar" or "complete fibber" may be more suitable in formal settings. When employing this phrase, it's crucial to assess the context and audience to ensure appropriate and effective communication.
More alternative expressions(10)
Phrases that express similar concepts, ordered by semantic similarity:
outright liar
Emphasizes the directness and lack of subtlety in the lie.
barefaced liar
Stresses the boldness and shamelessness of the lie.
complete fibber
Slightly less harsh and more playful than "big fat liar".
chronic liar
Focuses on the habitual nature of the lying.
pathological liar
Implies a psychological compulsion to lie.
consummate liar
Highlights the skill and expertise in lying.
arrant deceiver
More formal and emphasizes the act of deception.
total fabrication
Shifts focus from the person to the lie itself as a complete invention.
mendacious individual
A more formal and less common way of describing a liar.
untruthful person
A straightforward and neutral alternative.
FAQs
What does the phrase "big fat liar" mean?
The phrase "big fat liar" is an emphatic way to call someone a liar, suggesting they are not only dishonest but also that their lies are significant and blatant.
Is "big fat liar" considered offensive?
Yes, "big fat liar" is generally considered an offensive term. It's best to avoid using it in formal or professional settings.
What are some alternatives to "big fat liar"?
Some alternatives to "big fat liar" include "outright liar", "complete fibber", or simply "liar", depending on the level of emphasis you want to convey.
How can I use the phrase "big fat liar" in a sentence?
You can use "big fat liar" to express strong disagreement and accusation. For example: "He claimed he didn't know about the missing money, but I think he's a "big fat liar".
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