loose cannon

Cunha has been linked with a big-money move over the past year with Europe's top clubs keen, but he may be viewed as a loose cannon because of his antics.

Some of the grapevine talk has gotten back to her — how she’s a loose cannon or stirring the pot to cover up for complaints accusing her of misconduct.

That’s not to say that Harris is best as a loose cannon.

The Trump campaign appears to understand this reality, but its candidate has slipped back into loose cannon mode.

They have also tended to produce loose cannons throughout the ranks.