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
didn't pass muster
Grammar usage guide and real-world examplesTable of contents
Human-verified examples
Expert writing tips
Linguistic context
Ludwig's wrap-up
Alternative expressions
FAQs
Human-verified examples from authoritative sources
Exact Expressions
37 human-written examples
Still, their paperwork didn't pass muster.
News & Media
That argument didn't pass muster with many Democrats.
News & Media
Our design, a modern house, didn't pass muster".
News & Media
This wolf didn't pass muster, even for a two-year-old.
News & Media
"Buffy" is big there, but "Hex" didn't pass muster with fans of the American show.
News & Media
"Editorials and news coverage in numerous American communities responded with a clear message that such measures simply didn't pass muster for their communities," wrote Trudy Lieberman.
News & Media
Human-verified similar examples from authoritative sources
Similar Expressions
23 human-written examples
The cubes did not pass muster.
News & Media
In 2010 the EPA announced that the scheme did not pass muster.
News & Media
Republicans said Senate negotiations had produced a compromise that did not pass muster in the House.
News & Media
In the end, fully one-third of the applications did not pass muster.
News & Media
Salcido's attempted clarification did not pass muster with at least one fellow council member.
News & Media
Expert writing Tips
Best practice
Incorporate this phrase to add a touch of sophisticated, idiomatic flair to your writing without becoming overly informal.
Common error
Do not confuse this phrase with the similarly structured idiom "cut the mustard". While both deal with adequacy, "didn't pass muster" refers specifically to failing an inspection or standard of assembly (historically military), whereas failing to "cut the mustard" suggests an inability to perform a task.
Source & Trust
94%
Authority and reliability
4.8/5
Expert rating
Real-world application tested
Linguistic Context
The phrase "didn't pass muster" functions as an idiomatic verb phrase. According to Ludwig examples, it consists of the auxiliary verb "did", the negative particle "not" (contracted) and the transitive verb construction "pass muster". It acts as the predicate of a sentence to denote a negative evaluative outcome.
Frequent in
News & Media
75%
Academia
15%
Formal & Business
10%
Less common in
Wiki
5%
Social Media
2%
Reference
1%
Ludwig's WRAP-UP
In summary, "didn't pass muster" is a robust and widely accepted idiom used to describe something that has failed a test of quality or validity. Analysis from Ludwig show its heavy concentration in high-quality journalism, indicating its status as a reliable phrase for professional communication. Derived from the military practice of inspecting gathered troops (a muster), the expression has evolved to cover everything from legal arguments to culinary standards. When using this phrase, ensure you are referring to a failure to meet an established standard rather than just a general lack of success, and always distinguish it from the unrelated idiom "cut the mustard".
More alternative expressions(10)
Phrases that express similar concepts, ordered by semantic similarity:
didn't measure up
Focuses more on comparing a result against a specific quantitative or qualitative benchmark
didn't make the grade
Implies a failure to reach a necessary level of quality or status
failed to satisfy
Uses a more literal and formal tone compared to the idiomatic nature of the original phrase
was not up to scratch
A more informal, British-leaning idiom that similarly denotes insufficient quality
fell short of expectations
Emphasizes the disappointment of the observer rather than the formal failure of the object
did not cut the mustard
A colorful idiom that is slightly more informal and suggests a lack of ability or success
was found wanting
A literary and formal way to say something was inadequate after inspection
failed the test
Specifically denotes failure in a trial or examination scenario
was rejected
Describes the final outcome of failing to pass muster rather than the state of failing
wasn't good enough
The simplest, most direct plain-English equivalent
FAQs
What is the meaning of "didn't pass muster"?
It means that a person, object or idea failed to reach an acceptable standard or was found inadequate upon inspection. It is often used in professional contexts to describe things like legal arguments or product quality that "failed to meet expectations".
Is it "pass muster" or "pass mustard"?
The correct phrase is "pass muster". The word "muster" refers to a formal gathering of troops for inspection. Using "mustard" is a common eggcorn; if you want to use a mustard-based idiom, you should say "didn't cut the mustard" instead.
How do I use "didn't pass muster" in a sentence?
You can use it to describe something that was rejected after being checked. For example: "The architect's initial design "didn't pass muster" with the city planning committee".
What are some synonyms for "didn't pass muster"?
Depending on your context, you can use phrases like "didn't measure up", "wasn't up to scratch" or "failed inspection".
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
Human-verified examples
Expert writing tips
Linguistic context
Ludwig's wrap-up
Alternative expressions
FAQs
Source & Trust
94%
Authority and reliability
4.8/5
Expert rating
Real-world application tested