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
fundamental flaw
Grammar usage guide and real-world examplesUSAGE SUMMARY
The phrase "fundamental flaw" is correct and usable in written English.
It can be used to describe a basic or essential error or defect in a system, argument, or concept. Example: "The fundamental flaw in the theory is that it does not account for external variables."
✓ Grammatically correct
News & Media
Science
Alternative expressions(20)
fundamental error
inherent cause
underlying difficulty
potential issue
major shortcoming
central problem
inherent problem
core issue
inherent issue
critical flaw
own issue
intrinsic issue
inherent difficulty
inescapable problem
intrinsic problem
inevitable issue
unavoidable complication
structural weakness
inherent limitation
built-in limitation
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
57 human-written examples
It's a fundamental flaw".
News & Media
"That's their fundamental flaw".
News & Media
Foster saw this as a fundamental flaw.
News & Media
This is the film's fundamental flaw.
News & Media
Critics, however, see a fundamental flaw in the reform model.
News & Media
This isn't a fundamental flaw of the flash mob.
News & Media
For workers, that is a fundamental flaw in today's economy.
News & Media
That's the fundamental flaw in the government's strategy".
News & Media
"This is a fundamental flaw in the study.
News & Media
SB: That's a fundamental flaw in the system.
News & Media
These proposals are intended to address a fundamental flaw in money market funds.
News & Media
Expert writing Tips
Best practice
When using "fundamental flaw", ensure you clearly articulate what that flaw is and its consequences. Be specific rather than vague to strengthen your argument.
Common error
Avoid labeling every issue as a "fundamental flaw". Reserve this term for truly critical shortcomings that undermine the entire system or argument, not minor imperfections.
Source & Trust
88%
Authority and reliability
4.5/5
Expert rating
Real-world application tested
Linguistic Context
The phrase "fundamental flaw" functions as a noun phrase where the adjective "fundamental" modifies the noun "flaw". It serves to identify a critical weakness or defect that is central to the failure or inadequacy of something. As Ludwig AI confirms, this usage is correct and widely applicable.
Frequent in
News & Media
54%
Science
28%
Formal & Business
8%
Less common in
Academia
5%
Encyclopedias
3%
Reference
2%
Ludwig's WRAP-UP
In summary, "fundamental flaw" is a commonly used and grammatically correct phrase that identifies a critical weakness or defect. Ludwig AI validates its proper usage across various contexts. Predominantly found in News & Media and Science, this phrase serves to critique or analyze by highlighting core problems. For effective writing, be specific when identifying the flaw and avoid overusing the term for minor issues. Alternatives include "key weakness" or "critical defect". By understanding its function, purpose, and appropriate usage, you can effectively incorporate "fundamental flaw" into your writing.
More alternative expressions(6)
Phrases that express similar concepts, ordered by semantic similarity:
core fault
Replaces "flaw" with "fault", stressing a mistake or error in design or construction.
critical defect
Emphasizes the fault as a "defect", suggesting an imperfection that impairs functionality.
essential error
Highlights the mistake as an "error", suggesting a deviation from accuracy or correctness.
key weakness
Replaces "flaw" with "weakness", focusing on a point of vulnerability or lack of strength.
major shortcoming
Substitutes "flaw" with "shortcoming", highlighting an imperfection or limitation.
basic deficiency
Replaces "flaw" with "deficiency" implying a lack or shortage of something essential.
chief imperfection
Replaces "flaw" with "imperfection", emphasizing a state of being not perfect or complete.
inherent limitation
Highlights that the "limitation" is intrinsic and naturally part of something.
central problem
Shifts the focus to the issue being a "problem", implying a difficulty or challenge.
primary vulnerability
Focuses on the susceptibility to harm or damage as a "vulnerability".
FAQs
How can I use "fundamental flaw" in a sentence?
You can use "fundamental flaw" to point out a critical error in a system, argument, or design. For instance, "The "fundamental flaw" in the plan was its reliance on outdated data."
What are some alternatives to "fundamental flaw"?
Alternatives include "key weakness", "critical defect", or "major shortcoming". The best choice depends on the specific nuance you want to convey.
Is it better to say "basic flaw" or "fundamental flaw"?
"Fundamental flaw" often implies a more significant and foundational problem than "basic flaw". While both are acceptable, "fundamental flaw" suggests the issue is central to the failure of something.
What's the difference between a "fundamental flaw" and a "minor error"?
A "fundamental flaw" is a critical issue that undermines the core functionality or validity of something, while a "minor error" is a less significant mistake that does not critically impact the overall outcome.
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
88%
Authority and reliability
4.5/5
Expert rating
Real-world application tested