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
slack lips
Grammar usage guide and real-world examplesUSAGE SUMMARY
'slack lips' is a correct and usable phrase in written English.
It is a metaphor that is used to describe someone's facial expression when they are tired or bored, or when they are not paying attention. For example, "The student had a slack lips expression on his face during the lecture."
✓ Grammatically correct
News & Media
Alternative expressions(5)
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
Bubbles are emerging from its slack lips.
News & Media
Human-verified similar examples from authoritative sources
Similar Expressions
57 human-written examples
Loose lips sink startups.
News & Media
MPs bleat goatishly from slack, grinning lips.
News & Media
The glazed eyes, the slack lower lip, the hands positioned like adorable puppy paws.
News & Media
Savanna has fallen asleep, her lips slack around the nipple.
News & Media
She locked her arms behind his neck and clung to him, her lips slack and wet.
News & Media
At 68, he now wore a face lined with deep folds, and his lips hung slack, crested with a sparse mustache.
News & Media
Iron Man, a more recent creation, is recognisable as a sneering, insincere slacker: nothing heartfelt ever passes through his lips; the very thought of saying something honest and authentic would mortify him.
News & Media
"I, sirs, am a splendid specimen!" One will notice that the woman wipes her hand on her slacks because the mere thought of his lips touching her makes the flesh creep.
News & Media
As we approach Christmas, it's time for good startup boys and girls to slack off and, most importantly, record bad lip dubs of Mariah Carey songs.
News & Media
The men, barefoot and wearing worn slacks and shirts, sway softly, palms forward, eyes rolled back, lips moving noiselessly.
News & Media
Expert writing Tips
Best practice
Use "slack lips" to subtly convey a character's fatigue, boredom, or lack of engagement in descriptive writing, avoiding more overt or cliché expressions.
Common error
Avoid using "slack lips" in formal or professional settings where a more precise or neutral description of facial expression is required. Opt for terms like "relaxed" or "slightly open" depending on the specific context.
Source & Trust
88%
Authority and reliability
4.2/5
Expert rating
Real-world application tested
Linguistic Context
The phrase "slack lips" functions primarily as a descriptive element, adding detail to character portrayals or scene settings. Ludwig AI indicates that it's used to describe a facial expression, often implying a lack of tension or alertness.
Frequent in
News & Media
100%
Less common in
Science
0%
Formal & Business
0%
Wiki
0%
Ludwig's WRAP-UP
In summary, "slack lips" is a descriptive phrase used to depict a relaxed, inattentive, or tired facial expression. Ludwig AI confirms its grammatical correctness and usage in diverse contexts, primarily within news and media. While "slack lips" may not be suitable for formal contexts, it serves as a vivid descriptor in creative and descriptive writing. Related phrases such as "drooping lips" or "relaxed lips" can serve as alternative depending on intended meaning. The phrase, though rare, can effectively enhance character portrayals and scene settings.
More alternative expressions(10)
Phrases that express similar concepts, ordered by semantic similarity:
drooping lips
Emphasizes the downward movement of the lips, suggesting sadness or fatigue.
limp lips
Indicates a lack of firmness or rigidity in the lips.
flaccid lips
Highlights the lack of muscle tone in the lips.
unresponsive lips
Suggests a lack of reaction or movement in the lips.
loose lips
Focuses on indiscretion in speech rather than facial expression.
expressionless lips
Shifts the focus to the absence of emotion conveyed by the lips.
relaxed lips
Indicates a state of ease or lack of tension in the lips.
parted lips
Focuses on the separation of the lips, often implying surprise or anticipation.
open mouth
Broadens the description to include the entire mouth, suggesting shock or inattention.
vacant expression
Moves away from the lips specifically and describes the overall facial appearance of emptiness or lack of awareness.
FAQs
How can I describe "slack lips" in a more formal way?
Depending on the context, you could use phrases like "relaxed lips", "slightly parted lips", or "lips lacking tension" to convey a similar meaning with a more neutral tone.
What does it mean when someone has "slack lips"?
Generally, "slack lips" suggests a state of relaxation, inattention, or fatigue. It can also imply a lack of emotional expression or a blank facial expression.
What are some alternative phrases to "slack lips"?
Alternatives include "drooping lips", "limp lips", or "relaxed lips", depending on the specific nuance you want to convey. /s/relaxed+lips
Is "slack lips" considered a negative description?
While not inherently negative, "slack lips" can sometimes carry a slightly unfavorable connotation, implying a lack of alertness or engagement. Consider the context and your intended meaning when using the phrase.
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
4.2/5
Expert rating
Real-world application tested