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
a difficult challenge to
Grammar usage guide and real-world examplesUSAGE SUMMARY
The phrase "a difficult challenge to" is correct and usable in written English.
It can be used when describing a task or situation that is particularly hard to overcome or accomplish. Example: "Completing the project on time proved to be a difficult challenge to manage given the limited resources."
✓ Grammatically correct
Science
News & Media
Formal & Business
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
34 human-written examples
This is, at first blush, a difficult challenge to meet.
Encyclopedias
A difficult challenge to moral realism is the "evolutionary challenge".
News & Media
"They know it's a phony promise, but it's selling, and giving us a difficult challenge to make a complicated rebuttal to a simple issue," Mr. Jacobs said.
News & Media
Bennett also reaffirmed Burgess's comments about England's potential to succeed, despite them now facing a difficult challenge to make the final.
News & Media
All this sets a difficult challenge to the champions of the science and technology subjects, always the Cinderellas of British higher education.
News & Media
Jose Mourinho got his hands back on the Premier League trophy in 2014/15 as Chelsea cruised to the title, but they face a difficult challenge to retain their crown this season.
News & Media
Human-verified similar examples from authoritative sources
Similar Expressions
24 human-written examples
As the database of Rfam families has been obtained based on alignments to specific 'reference structures,' it will be a particularly difficult challenge to demonstrate that there is an alternative structure that is superior in the identification of family members.
Science
Therefore, it still remains an extremely difficult challenge to find a simple and mild synthetic route to synthesize well-controlled ZnO nanoparticles.
And with it begins a potentially difficult challenge to find Shockey's replacement.
News & Media
"I felt that was a very difficult challenge to make work, and I started to explore other ways to solve it".
News & Media
The latter now face a very difficult challenge to hang on to their lead, one compounded by the upshot of the problem for the No18 car.
News & Media
Expert writing Tips
Best practice
When using "a difficult challenge to", ensure that the context clearly defines what entity or person faces the challenge. Be specific about who or what is being challenged for better clarity.
Common error
Avoid using "a difficult challenge to" for tasks that are generally straightforward. Save it for situations that genuinely present significant obstacles or complexities, or it loses its impact.
Source & Trust
82%
Authority and reliability
4.5/5
Expert rating
Real-world application tested
Linguistic Context
The phrase "a difficult challenge to" functions as a noun phrase, typically serving as a subject complement or object in a sentence. It describes something or someone facing a task that demands considerable effort or skill, as indicated by Ludwig's examples.
Frequent in
Science
33%
News & Media
46%
Formal & Business
8%
Less common in
Encyclopedias
4%
Wiki
4%
Reference
0%
Ludwig's WRAP-UP
The phrase "a difficult challenge to" is a commonly used expression to describe tasks or situations that present significant obstacles. Ludwig's analysis confirms it is grammatically correct and suitable for various contexts, especially in science and news media. When using this phrase, clarity is key: specify what or who faces the challenge. While alternatives like "a tough challenge for" or "a formidable obstacle to" exist, "a difficult challenge to" effectively conveys the demanding nature of the subject at hand. According to Ludwig, overuse in simple contexts should be avoided to maintain its impact.
More alternative expressions(10)
Phrases that express similar concepts, ordered by semantic similarity:
a tough challenge for
Replaces "difficult" with "tough", and "to" with "for", slightly altering the focus of the challenge.
a formidable obstacle to
Substitutes "difficult challenge" with "formidable obstacle", emphasizing the hindering aspect.
a demanding task for
Replaces "challenge" with "task" and "difficult" with "demanding", shifting the emphasis to the effort required.
a significant impediment to
Replaces "difficult challenge" with "significant impediment", highlighting the obstructive nature.
a major hurdle to
Substitutes "difficult challenge" with "major hurdle", creating a more metaphorical expression of difficulty.
a complex problem for
Replaces "challenge" with "problem" and "difficult" with "complex", focusing on the intricate nature of the situation.
a tricky situation for
Replaces "difficult challenge" with "tricky situation", downplaying the severity while maintaining the sense of difficulty.
a steep learning curve for
Uses a specific type of challenge related to learning, implying a need for rapid adaptation.
a rigorous test for
Replaces "difficult challenge" with "rigorous test", changing the framing to an evaluation or trial.
a considerable undertaking for
Substitutes the phrase with a description of the task's scale and effort.
FAQs
How can I use "a difficult challenge to" in a sentence?
You can use "a difficult challenge to" to describe a task or situation that presents significant obstacles or requires considerable effort. For example, "Adapting to the new regulations presents a difficult challenge to small businesses."
What are some alternatives to "a difficult challenge to"?
Some alternatives include "a tough challenge for", "a formidable obstacle to", or "a demanding task for", depending on the specific nuance you want to convey.
Is it better to say "a difficult challenge to" or "a challenge to"?
Using "a difficult challenge to" emphasizes the level of difficulty involved. "A challenge to" is more general and does not specify the degree of difficulty.
What's the difference between "a difficult challenge to" and "a difficult challenge for"?
While both are similar, "a difficult challenge to" often implies the challenge is directed at or impacting something, whereas "a difficult challenge for" focuses on who is experiencing the challenge.
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
82%
Authority and reliability
4.5/5
Expert rating
Real-world application tested