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
loose cannon
Grammar usage guide and real-world examplesUSAGE SUMMARY
"loose cannon" is a correct and commonly used phrase in written English.
It is often used to describe someone or something that is unpredictable or uncontrollable, like a cannon that has broken free from its moorings and is rolling around, causing chaos. Example: The new manager is a bit of a loose cannon, you never know what he's going to do next. In this sentence, "loose cannon" is used to describe the manager as someone who is unpredictable and can cause disruption or chaos in the workplace.
✓ 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
"That's a loose cannon.
News & Media
"[Trump] is a loose cannon.
News & Media
BLOOMBERG A Loose Cannon for Murdoch?
News & Media
Ms Reding is a loose cannon.
News & Media
He's a loose cannon; let him be.
News & Media
Mike Brown is a loose cannon.
News & Media
Burress was always a loose cannon.
News & Media
He can be a loose cannon.
News & Media
"He was a loose cannon," Mr. Walker said.
News & Media
Human-verified similar examples from authoritative sources
Similar Expressions
2 human-written examples
-- we are left with Loose-Cannon Latrell.
News & Media
Her dutiful protection of her father could turn loose-cannon deadly.
News & Media
Expert writing Tips
Best practice
Use "loose cannon" when you want to emphasize not only unpredictability but also the potential for causing damage or disruption, especially within a group or organization. For example, "He's a "loose cannon", and his actions could jeopardize the entire project."
Common error
While "loose cannon" is a vivid expression, overusing it can diminish its impact. Opt for more nuanced descriptions of someone's behavior when appropriate. For example, instead of always saying "He's a "loose cannon"", sometimes describe him as "unpredictable" or "unreliable".
Source & Trust
87%
Authority and reliability
4.5/5
Expert rating
Real-world application tested
Linguistic Context
The phrase "loose cannon" functions primarily as a noun, often used attributively to describe a person or entity that is unpredictable and potentially harmful. Ludwig AI confirms this with numerous examples where it modifies nouns like "person", "guy", or "behavior".
Frequent in
News & Media
85%
Wiki
5%
Formal & Business
3%
Less common in
Science
2%
Academia
2%
Reference
1%
Ludwig's WRAP-UP
The term "loose cannon" vividly describes someone or something unpredictable and potentially damaging. According to Ludwig AI, it's grammatically correct and very commonly used, particularly in News & Media. While its meaning is widely understood, overusing it can lessen its impact; consider alternatives such as "unpredictable person" or "maverick". However, the phrase is a warning sign. When used appropriately, "loose cannon" emphasizes the risk that an individual or element poses due to their unreliability and potential for causing disruption.
More alternative expressions(10)
Phrases that express similar concepts, ordered by semantic similarity:
unpredictable person
This alternative focuses on the human element of unpredictability, omitting the implication of potential harm or damage.
rogue element
This phrase highlights the element of being outside established rules or control, often within a group.
maverick
This suggests independence and unconventionality, but it doesn't necessarily imply being dangerous or harmful.
wild card
This term emphasizes the unpredictable nature and potential to change outcomes, but lacks the negative connotation.
out of control
This directly describes the lack of control, but it's a broader term and doesn't specify the potential for harm.
erratic individual
Focuses on the inconsistency of behavior, lacking the implication of causing damage.
unaccountable agent
Highlights the lack of responsibility and oversight, but is more formal and less vivid.
unruly person
Suggests a lack of discipline and order, but not necessarily danger.
unmanageable element
This focuses on the difficulty of controlling something or someone, without emphasizing the danger aspect.
outlier
This highlights deviation from the norm, but doesn't inherently imply negative consequences.
FAQs
How can I use "loose cannon" in a sentence?
"Loose cannon" is typically used to describe a person or thing that is unpredictable and potentially dangerous. For example, "The senator is considered a "loose cannon" because of his controversial statements."
What is a less common alternative to "loose cannon"?
While "loose cannon" is common, you could use "unpredictable person" or "maverick" to convey a similar meaning without using the cliché.
Is it appropriate to use "loose cannon" in formal writing?
While "loose cannon" is widely understood, it might be too informal for certain academic or business contexts. Consider alternatives like "unaccountable agent" for a more professional tone.
What's the difference between "loose cannon" and "wild card"?
Both phrases describe unpredictability, but "loose cannon" implies a higher risk of causing damage or disruption. "Wild card" simply means the person or thing is unpredictable but may not be dangerous. You could say that someone is acting like "rogue element".
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
87%
Authority and reliability
4.5/5
Expert rating
Real-world application tested