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 sly grin
Grammar usage guide and real-world examplesUSAGE SUMMARY
'a sly grin' is correct and usable in written English.
You can use it to describe someone's facial expression when they have done something mischievous or clever. For example: "The student's teacher could not help but crack a smile when he saw the student's sly grin".
✓ Grammatically correct
News & Media
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
"Oh," he said to the moderator, with a sly grin.
News & Media
With a sly grin, he replied, "Don't you know?
News & Media
The presidential hopeful aims a sly grin at the camera.
News & Media
"There's a reason why it's a secret ballot," Mr. Sandburg said with a sly grin.
News & Media
"I don't have time today," the mayor said, with a sly grin.
News & Media
"He's not really that good, is he?" asked Iniesta's teammate, Juan Mata, with a sly grin.
News & Media
"I love the quiet during moments like this," she noted, flashing a sly grin.
News & Media
"The most beautiful colors, of course," he said with a sly grin.
News & Media
He added, with a sly grin, "That's all I can say — they're more attractive".
News & Media
Human-verified similar examples from authoritative sources
Similar Expressions
2 human-written examples
"We'll let them have the garbage back," he said with a sly grin.
News & Media
A sly grin will be considered the same as smiling.
News & Media
Expert writing Tips
Best practice
Use "a sly grin" to subtly hint at hidden intentions or amusement, rather than stating them directly. This can add depth and intrigue to your writing.
Common error
Avoid using "a sly grin" as a generic descriptor for any type of smile. It specifically denotes a knowing, mischievous, or subtly cunning expression. Using it indiscriminately weakens its impact and may misrepresent the character's emotion.
Source & Trust
89%
Authority and reliability
4.6/5
Expert rating
Real-world application tested
Linguistic Context
The phrase "a sly grin" functions as a noun phrase, typically serving as the object of a verb or the subject complement. It describes a specific type of facial expression. Ludwig confirms its grammatical correctness and usability.
Frequent in
News & Media
100%
Less common in
Formal & Business
0%
Science
0%
Encyclopedias
0%
Ludwig's WRAP-UP
In summary, "a sly grin" is a common and grammatically sound noun phrase used to depict a knowing or mischievous facial expression. Primarily found in news and media contexts, it serves to subtly convey amusement, secret knowledge, or cunning intent. According to Ludwig, this phrase is perfectly acceptable for use in written English. While alternatives like "a mischievous smile" or "a knowing smile" exist, "a sly grin" offers a distinct nuance of subtle craftiness, making it a valuable descriptor in various writing scenarios.
More alternative expressions(10)
Phrases that express similar concepts, ordered by semantic similarity:
a sly smirk
Shares a similar meaning, but 'smirk' can sometimes imply a more restrained or subtle expression.
a mischievous smile
Highlights the playful or impish nature of the smile.
a playful grin
Highlights the lighthearted and teasing nature of the smile.
a knowing smile
Emphasizes the awareness or understanding behind the smile, rather than the mischievous aspect.
a secretive smile
Focuses on the hidden or concealed nature of the smile.
a cunning smile
Emphasizes the cleverness or artfulness associated with the smile.
a wicked grin
Suggests a more malevolent or sinister intent behind the smile.
a smug smile
Implies self-satisfaction or excessive pride.
a knowing glance
Shifts the focus from the mouth to the eyes, implying a shared secret or understanding.
a mischievous twinkle in the eye
Similar to "a sly grin", but the focus is placed on the eyes and the mischievous intent.
FAQs
How can I effectively use "a sly grin" in a sentence?
Use "a sly grin" to describe a character's expression when they are amused by something they are not supposed to be, when they have a secret plan, or when they know something others don't. For example, "He watched the chaos unfold with "a sly grin", knowing his plan was working perfectly".
What are some situations where I might use "a sly grin"?
You might use it to describe a character who is about to play a trick, has just gotten away with something, or is secretly pleased about an outcome. Consider alternatives like "a mischievous smile" or "a knowing smile" for slightly different nuances.
What's the difference between "a sly grin" and "a smirk"?
While both suggest a knowing or self-satisfied expression, "a sly grin" typically implies a playful or mischievous intent, whereas "a smirk" can often carry a connotation of arrogance or disdain. Choose the word that best fits the character's underlying emotion.
Are there any negative connotations associated with "a sly grin"?
Yes, depending on the context, "a sly grin" can suggest dishonesty, manipulation, or a lack of sincerity. It's important to consider the character's motivations and the overall tone of the writing when using this phrase. In some cases, alternatives like "a wicked grin" or "a cunning smile" may be more appropriate to emphasize the negative aspects.
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
89%
Authority and reliability
4.6/5
Expert rating
Real-world application tested