a loose cannon

a loose cannon

a person who cannot be completely trusted because their behaviour is sometimes strange or violent He's seen as a loose cannon by other team members. If anyone's going to get into a fight, it'll be Pete.
See also: cannon, loose
References in periodicals archive ?
On the pitch he's a great player that every coach would want in his team, but off it he's a loose cannon.
Inevitably critics will dismiss Ms Short as a loose cannon with her own agenda.
He (Blatter) is a bit of a loose cannon, He's an embarrassment to FIFA.
Mcllvaine told the Philadelphia Inquirer, "He's such a loose cannon.
So what if Odalis Perez is something of a loose cannon who tends to alienate a teammate every time he opens his mouth or cranks up the volume on the clubhouse stereo system?
The Speaker of the House viewed him as something of a loose cannon, but also as someone who could be useful if he could be held in check.
Though a very sweet dog, a spotty discipline regimen has turned Sid into a bit of a loose cannon in the behavior department.
John to me is known as a loose cannon, something I was like all my life,' he said.
A loose cannon who delights in attacking environmentalists in coarse language, the oil state congressman is a prime House author of "takings" legislation designed to protect property owners from the enforcement of environmental laws.
Hussein was a loose cannon, but he was considered a loose cannon that could be brought under control with cautious diplomacy and economic blandishments.
If Mundie's remark was just the mental equivalent of a loose cannon on the deck of the Microsoft ship of state, we could suggest pushing the cannon overboard.
I am really sick of people who, out of ignorance or stupidity or fear, criticize Larry for being a loose cannon.
A loose cannon, Fields and his redneck friends believe America is being ``invaded'' and if they don't act soon, they will be forced to eat ``beans and tortillas'' for the rest of their lives
Last year he published his memoirs in a book called A Loose Cannon, which detailed his struggle with the world of finance.