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
cool
Grammar usage guide and real-world examplesUSAGE SUMMARY
The phrase "cool" is correct and usable in written English, particularly in informal contexts.
It can be used to express approval, admiration, or agreement with something. Example: "That new movie was really cool; I loved the special effects."
✓ Grammatically correct
News & Media
Lifestyle
Travel
Sport
Music
Tech
Business
Opinion
Film
World
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
Drain and leave to cool.
News & Media
"On pouring day there were over 50 people involved pouring the chocolate into the mould and it took 10 hours to do, then a further three days to cool off".
News & Media
Calculating that two in three of 1.4 million "frontline" care workers in the UK are paid below the living wage, it reckons it would cost a cool £2.3bn a year to bring them all up to that level – not counting £142m needed to end non-compliance with the minimum wage.
News & Media
Can we entice you with our Cool Blue Ocean Acidifier with a topping of crumbled reef coral?
News & Media
It is cool here!" Bobo, who speaks six languages, was a charming guide with a great sense of humour – and great fashion sense, mixing a batik suit with a modern gilet, or zebra-print shorts with a trendy T-shirt.
News & Media
Opening the bags of infant leaves of rocket and oak-leaf lettuce, basil and nasturtium, hot mustard and cool butterhead is a daily ritual that is as much a part of my life as a morning espresso.
News & Media
Then there's the local craft beer on show at Craft Pride, and the laid back cool of dining rooms such as Tyson Cole's award-winning Japanese-inspired Uchi.
News & Media
"Geiz ist geil" (stinginess is cool) has caught on ever since the electronics chain Saturn started saying it 10 years ago.
News & Media
"I've just been singing my baby nursery rhymes, so I don't really know what's cool and what's not".
News & Media
Once in, I sat on the grass, hoping, hoping, hoping to get a touch of the ball, as it sped over the so, so smooth field, my feet occasionally, rakishly, rebelliously, resting over the rope to show just how cool I was.
News & Media
Make your own rhubarb cordial – put 400-450g rhubarb, 250g sugar, the juice of half a lemon and 500ml water in a pan, bring to a boil, simmer until the rhubarb has disintegrated, then cool, strain through muslin into a jug (it will take a few hours to drip through) and refrigerate; or buy a decent commercial brand.
News & Media
Expert writing Tips
Best practice
When describing a person's demeanor, "cool" suggests calmness and composure. This can be used to describe how someone handles a stressful situation effectively.
Common error
Avoid using "cool" in formal or academic writing where more sophisticated vocabulary is expected. Opt for words like "excellent" or "remarkable" instead.
Source & Trust
100%
Authority and reliability
4.8/5
Expert rating
Real-world application tested
Linguistic Context
The word "cool" functions primarily as an adjective, describing something as fashionable, calm, or moderately cold. According to Ludwig AI, it's correct and commonly used. It can also function as a verb meaning 'to become colder'.
Frequent in
News & Media
26%
Lifestyle
20%
Travel
7%
Less common in
Sport
7%
Music
5%
Tech
2%
Ludwig's WRAP-UP
The term "cool" is a versatile word primarily used as an adjective to describe something as fashionable, calm, or slightly cold. Ludwig AI confirms its grammatical correctness and common usage across various contexts. While it's suitable for informal communication, more formal synonyms might be preferred in academic or professional writing. Predominantly featured in news and media sources, "cool" expresses approval, admiration, or a state of being, solidifying its role in everyday language.
More alternative expressions(6)
Phrases that express similar concepts, ordered by semantic similarity:
Awesome
Informal synonym for something impressive or admirable.
Fantastic
Similar to awesome but can also emphasize imaginative or creative qualities.
Excellent
Direct synonym expressing a high degree of approval.
Outstanding
Suggests something is exceptionally good or better than average.
Impressive
Focuses on the quality of eliciting admiration or respect.
Terrific
Another synonym for something very good or pleasing.
Great
Common synonym expressing general approval or satisfaction.
Wonderful
Synonym emphasizing the pleasant or delightful nature of something.
Exceptional
Highlights something that is outside the norm and particularly good.
Remarkable
Emphasizes the noteworthy or exceptional quality of something.
FAQs
How can I use "cool" in a sentence?
You can use "cool" to describe something that is fashionable, calm, or slightly cold. For example: "That new jacket is really cool", "He remained cool under pressure", or "The cool breeze was refreshing".
What can I say instead of "cool"?
Is it appropriate to use "cool" in formal writing?
While "cool" is widely understood, it's generally better to use more formal synonyms like "excellent", "remarkable", or "impressive" in academic or professional contexts.
What does it mean when someone describes a person as "cool"?
When describing a person, "cool" typically suggests that they are calm, composed, and perhaps fashionable or popular. It implies a sense of effortless competence and self-assuredness.
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
100%
Authority and reliability
4.8/5
Expert rating
Real-world application tested