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
difficult one
Grammar usage guide and real-world examplesUSAGE SUMMARY
The phrase "difficult one" is correct and can be used in written English.
It is often used to refer to a specific thing or situation that is challenging or complicated. Example: "The math problem was a difficult one, but with some help from the teacher, I was able to solve it."
✓ Grammatically correct
News & Media
Science
Encyclopedias
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
60 human-written examples
Is that the difficult one?
News & Media
Difficult one to answer.
News & Media
IME: Difficult one, that.
News & Media
Oh that's a difficult one.
News & Media
BD: He's a difficult one.
News & Media
This is a difficult one.
News & Media
It's a difficult one for Hollywood.
News & Media
Oh God, that's a difficult one.
News & Media
Is the governor's job a difficult one?
News & Media
This is the most difficult one.
News & Media
"It's the most difficult one to crack.
News & Media
Expert writing Tips
Best practice
Combine "difficult one" with specific reasons or explanations to provide context and clarity about the nature of the difficulty.
Common error
Avoid using "difficult one" as a generic descriptor. Instead, provide specific details about what makes the subject challenging to maintain clarity and impact. For example, instead of saying "The project was a difficult one", say "The project was a "difficult one" due to unforeseen technical challenges and tight deadlines".
Source & Trust
88%
Authority and reliability
4.6/5
Expert rating
Real-world application tested
Linguistic Context
The phrase "difficult one" functions as a descriptor, typically following a linking verb (e.g., is, was, seems). It attributes a quality of difficulty to a specific noun or situation. Ludwig examples show it modifying a range of subjects, from tasks to decisions.
Frequent in
News & Media
70%
Science
15%
Formal & Business
5%
Less common in
Encyclopedias
5%
Reference
3%
Social Media
2%
Ludwig's WRAP-UP
In summary, the phrase "difficult one" is a common and grammatically sound way to describe something challenging or complex. As Ludwig AI confirms, the phrase is correct and can be used in written English. It appears most frequently in news and media contexts, indicating its widespread use in general communication. While versatile, it's important to provide context to specify the nature of the difficulty. Consider related phrases like "tough one" or "tricky one" for nuanced variations. Remember to avoid overuse without specifics to maintain clarity in your writing.
More alternative expressions(6)
Phrases that express similar concepts, ordered by semantic similarity:
tough one
Replaces "difficult" with "tough", emphasizing the demanding nature of the subject.
tricky one
Substitutes "difficult" with "tricky", highlighting the potential for deception or requiring careful handling.
challenging one
Replaces "difficult" with "challenging", focusing on the stimulating and growth-oriented nature of the subject.
problematic one
Emphasizes the troublesome or unfavorable aspects of the situation.
complicated one
Focuses on the intricate and complex nature of the subject.
knotty one
Replaces "difficult" with "knotty", indicating an intricate and tangled issue.
complex situation
Shifts from a phrase to a noun phrase, emphasizing the overall intricacy of the circumstance.
sticky situation
Emphasizes the awkward and potentially problematic aspects of the situation.
delicate matter
Highlights the sensitivity and careful handling required for the subject.
awkward predicament
Emphasizes the embarrassing or uncomfortable aspects of the situation.
FAQs
How can I use "difficult one" in a sentence?
You can use "difficult one" to describe a challenging task, question, or situation. For example, "Choosing between the two options was a "difficult one"".
What can I say instead of "difficult one"?
You can use alternatives like "tough one", "tricky one", or "challenging one" depending on the specific context.
Is it appropriate to use "difficult one" in formal writing?
Yes, "difficult one" is generally acceptable in formal writing, especially when aiming for a conversational tone. However, more formal alternatives like "challenging situation" or "complex issue" may be preferred in highly formal contexts.
What's the difference between "difficult one" and "complicated one"?
"Difficult one" generally implies a challenge requiring effort or skill, while "complicated one" suggests intricacy and complexity. The choice depends on whether you want to emphasize the effort required or the complexity involved.
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
4.6/5
Expert rating
Real-world application tested