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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
a filthy liar
Grammar usage guide and real-world examplesUSAGE SUMMARY
The phrase "a filthy liar" is correct and usable in written English.
It can be used to describe someone who is perceived as dishonest or deceitful in a very strong and negative way. Example: "After discovering the truth, I realized he was nothing but a filthy liar who manipulated everyone around him."
✓ Grammatically correct
News & Media
Wiki
Alternative expressions(20)
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
3 human-written examples
She's a filthy liar.
News & Media
Or maybe everyone who says they've done it on a plane is a filthy liar and should be shamed for giving the rest of us such unrealistic expectations in spite of the inherent sexiness of air travel.
News & Media
One of the most stinging criticisms of Ivanka's lament came from John Podhoretz, columnist in the usually Trump-friendly New York Post, who called the first daughter a "filthy liar" in a tweet for saying she was shocked by ugly attacks in politics.
News & Media
Human-verified similar examples from authoritative sources
Similar Expressions
56 human-written examples
I just tried and Fandango is a dirty, filthy liar.
News & Media
If you don't you're a dirty filthy liar with no soul and may Andy Dufresne have mercy on your soul.
News & Media
And I will only say that Roger Goodell is a filthy fucking liar behind closed doors.
News & Media
Filthy liars.
News & Media
All candidates proved filthy liars and corrupt in the debates".
News & Media
Either they're not telling the truth, in which case I hate them for being filthy liars, or they are telling the truth, in which case I hate them because I'm deeply jealous.
News & Media
Back in Norbiton I've turned my tape recorder on and Zac is in full rant about politics being a filthy business, the Lib Dems being despicable, Susan Kramer being a liar.
News & Media
Just a filthy ball.
News & Media
Expert writing Tips
Best practice
When using the phrase "a filthy liar", be aware of its strong negative connotation and consider whether a less inflammatory term might be more appropriate, depending on your audience and the context.
Common error
Avoid using "a filthy liar" in professional or academic writing. Its informal and strongly negative tone is generally unsuitable for such settings.
Source & Trust
84%
Authority and reliability
4.1/5
Expert rating
Real-world application tested
Linguistic Context
The phrase "a filthy liar" functions as a noun phrase, specifically a descriptor, used to label someone considered dishonest. It is a more intense form of simply calling someone "a liar", adding an element of moral judgment and disgust. As noted by Ludwig, the phrase is usable in written English, albeit with careful consideration of context.
Frequent in
News & Media
33%
Wiki
33%
Science
0%
Less common in
Formal & Business
0%
Encyclopedias
0%
Social Media
0%
Ludwig's WRAP-UP
The phrase "a filthy liar" is a strong and pejorative descriptor used to express intense disapproval of someone's dishonesty. Ludwig confirms that it's grammatically correct, however, its informal register and strong negative connotations make it unsuitable for formal or professional contexts. When using this phrase, it's important to be mindful of the potential impact and consider whether a less inflammatory term might be more appropriate. Alternatives such as "despicable liar" or "vile deceiver" may convey a similar meaning with slightly less intensity.
More alternative expressions(10)
Phrases that express similar concepts, ordered by semantic similarity:
A despicable liar
Emphasizes the contemptibility of the liar's actions.
A vile deceiver
Highlights the wickedness and manipulative nature of the deception.
A blatant prevaricator
Focuses on the obvious and shameless nature of the lying.
A consummate falsifier
Suggests the liar is highly skilled and practiced in their deceit.
An outright fibber
A more informal term for someone who tells untruths.
A chronic fabricator
Implies the person is a habitual liar.
A mendacious individual
A formal way to describe someone prone to lying.
A pathological liar
Suggests a psychological condition driving the lying behavior.
A treacherous betrayer
Emphasizes the betrayal and harm caused by the liar.
A deceitful scoundrel
Combines dishonesty with a sense of being a rogue or rascal.
FAQs
How can I use "a filthy liar" in a sentence?
You can use "a filthy liar" to express strong disapproval of someone you believe is being dishonest. For example: "After the scandal, everyone knew he was "a filthy liar"."
What's a less offensive way to describe someone who is lying?
Consider using alternatives like "dishonest", "deceitful", or "untruthful", depending on the context.
What is the difference between "a liar" and "a filthy liar"?
"A liar" is a general term for someone who doesn't tell the truth. "A filthy liar" is a more emphatic and negative term, suggesting the person's dishonesty is particularly egregious or morally reprehensible.
Is it appropriate to call someone "a filthy liar" in a professional setting?
Generally, no. The phrase "a filthy liar" is highly informal and carries a strong negative connotation, making it unsuitable for most professional contexts. It's better to use more neutral language such as "untrustworthy" or "misleading".
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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
4.1/5
Expert rating
Real-world application tested