How do you say “A loose cannon” in Spanish?
The closest natural Spanish equivalent is una persona imprevisible, which literally means “an unpredictable person”. English speakers use a loose cannon to mean an unpredictable person whose uncontrolled actions may cause problems for others. Keep the risk clear by saying what trouble the person might cause. Register: neutral. Usage frequency: common.
Closest natural Spanish
una persona imprevisible
/ˈuna peɾˈsona impɾeβiˈsiβle/
- Literal meaning
- “an unpredictable person”
- Register
- neutral
- How often it's used
- common
- Equivalence
Close equivalent
86 out of 100
What a native Spanish speaker would actually say
“Una persona imprevisible” describes someone whose behaviour is hard to predict. Keep the risk in the sentence: they might ruin an agreement or make promises they can't keep.
Adding “peligrosa” means dangerous and can sound too strong. The English phrase doesn't necessarily suggest a threat of physical harm.
How close is the meaning?
- Meaning4 out of 5
- Tone4 out of 5
- Context4 out of 5
- Literal similarity1 out of 5
These ratings are editorial approximations, not measurements.
What are other ways to say it in Spanish?
alguien difícil de controlar
Literally: “someone difficult to control”
Less forceful; add the unpredictable behaviour if necessary.
Common translation traps
un verso suelto
This can simply describe an independent person, without the risk of trouble implied by “loose cannon.”
The notes above explain why these versions do not work in this context in Spanish.
In context
English
He's a loose cannon who could ruin the agreement.
Spanish
Es imprevisible y podría arruinar el acuerdo.
English
The team sees her as a loose cannon.
Spanish
El equipo la considera difícil de controlar y teme lo que pueda hacer.
Related expressions
- What “A loose cannon” means in English
- Rock the boat, Cause trouble or disrupt a stable situation.
- Get out of hand, To become uncontrolled or wild
Last updated 2026-09-16