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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
that appears challenging
Grammar usage guide and real-world examplesUSAGE SUMMARY
The phrase "that appears challenging" is correct and usable in written English.
You can use it when describing something that seems difficult or requires effort to understand or accomplish. Example: "The math problem that appears challenging at first can be solved with a simple formula."
✓ Grammatically correct
News & Media
Science
Wiki
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
1 human-written examples
Instead, my role as I see it is to teach individuals, groups, teams, or organizations about the understanding -- how the mind functions and how we shape our experience based only on the ebbs and flows of our thinking -- and then together (or sometimes without me) we'll find the answer to a specific issue that appears challenging.
News & Media
Human-verified similar examples from authoritative sources
Similar Expressions
55 human-written examples
To illustrate a "big idea" that appears to challenge conventional thinking, he deploys a series of well-told anecdotes that combine seamlessly with popularised accounts of relevant academic research and case studies.
News & Media
But it would give some of them certain rights now granted only to legal residents and citizens, including the ability to hold some state jobs — a provision that appears to challenge federal laws that prohibit the hiring of undocumented workers.
News & Media
Back at Sadler's Wells with a nameless new work celebrating that longevity, Lock and his team have lost none of their appetite for danger, with choreography that appears to challenge not only the limits of human physiology but also the most basic laws of physics.
News & Media
Mr. Copé was speaking during a meeting to introduce a U.M.P. digital policy paper that appeared to challenge the rationale for the three-strikes approach.
News & Media
Three major publishers said on Wednesday that they would allow their authors to access book sales data directly online, a move that appeared to challenge Amazon and its continued efforts to woo authors.
News & Media
Experts from the commission have examined a wealth of new evidence, including freshly disclosed Essex police files that appear to challenge the assertion that Bamber shot his adopted parents, June and Neville, his sister Sheila Caffell, and her six-year-old twins, Daniel and Nicholas, at their farm in the village of Tolleshunt D'Arcy.
News & Media
Do not appear challenge the bear(s)!
Wiki
But he never gave up the idea of making a monumental stone sculpture that appears to defy gravity and challenges our expectations of scale.
News & Media
Pull all three reports; challenge everything that appears incorrect.
Wiki
However, external factors, such as the lack of skills and knowledge of professionals, seem to be hampering the implementation of AAC in school settings – a phenomenon that appears to be a challenge reaching beyond South Africa, as reported in other studies (De Bertoli et al., 2014; Kent-Walsh, Stark, & Binger, 2008; Pickl, 2011; Soto, 1997).
Expert writing Tips
Best practice
Avoid overuse in highly formal writing. While grammatically correct, consider more sophisticated synonyms to enhance the tone and vocabulary.
Common error
Don't use "that appears challenging" when you have concrete evidence of the difficulty. If you know something is definitively challenging, state it directly rather than using the qualifier "appears". This makes your writing more precise and credible.
Source & Trust
81%
Authority and reliability
4.5/5
Expert rating
Real-world application tested
Linguistic Context
The phrase "that appears challenging" functions as a relative clause modifying a noun. It describes a characteristic or quality of the noun it modifies, indicating that something seems difficult or demanding. Ludwig AI confirms its correct usage.
Frequent in
News & Media
40%
Science
30%
Wiki
15%
Less common in
Formal & Business
10%
Encyclopedias
3%
Reference
2%
Ludwig's WRAP-UP
In summary, "that appears challenging" functions as a relative clause to describe something that seems difficult upon initial assessment. Ludwig AI indicates that this phrase is grammatically correct and usable in written English. While commonly found in News & Media, Science, and Wiki sources, it holds a neutral register suitable for various contexts. When using this phrase, ensure it accurately reflects a perceived rather than definitively confirmed difficulty. For alternatives, consider options like "that seems difficult" or "that presents a challenge" depending on the desired tone and emphasis.
More alternative expressions(10)
Phrases that express similar concepts, ordered by semantic similarity:
that seems difficult
Replaces "appears" with "seems" and "challenging" with "difficult", maintaining the core meaning.
that looks tough
Substitutes "appears" with "looks" and "challenging" with "tough", offering a more informal tone.
that presents a challenge
Transforms the adjective phrase into a noun phrase, emphasizing the challenge itself.
that poses difficulties
Replaces "challenging" with "difficulties" and uses the verb "poses" instead of "appears", altering the structure slightly.
that seems daunting
Substitutes "challenging" with "daunting", implying a more intimidating or overwhelming quality.
that presents an obstacle
Emphasizes the hindering nature of the challenge, framing it as an obstacle to overcome.
that is seemingly problematic
Introduces a more formal tone, highlighting the problematic nature of the situation.
that has apparent difficulties
Focuses on the visible or obvious nature of the difficulties.
that appears to be problematic
Adds "to be" and replaces "challenging" with "problematic", providing a slightly more verbose alternative.
that strikes as difficult
Uses idiomatic verb "strikes", making the phrase sound a bit more creative.
FAQs
What does "that appears challenging" mean?
The phrase "that appears challenging" means something seems difficult or demanding based on an initial assessment or observation. It indicates a perceived difficulty that may require effort or skill to overcome.
What can I say instead of "that appears challenging"?
You can use alternatives like "that seems difficult", "that looks tough", or "that presents a challenge" depending on the context.
How to use "that appears challenging" in a sentence?
You can use "that appears challenging" to describe a task, problem, or situation that seems difficult at first glance. For example, "The math problem that appears challenging at first can be solved with a simple formula."
What's the difference between "that appears challenging" and "that is challenging"?
"That appears challenging" suggests a perceived difficulty based on initial observation, while "that is challenging" indicates a confirmed or known difficulty. The former implies a possibility, while the latter states a fact.
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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
81%
Authority and reliability
4.5/5
Expert rating
Real-world application tested