Certainly their disposition was poor, and they caused mischief to those who offended them.
But Cornelius hasn't given up some hope of causing mischief.
Of course, small children cannot ignore anything, especially if it has any potential to cause mischief.
He looked ready to cause mischief again, until he saw her.
One of the common beliefs is that the little people create distractions to cause mischief.
"I put them in your war room, my lord, figuring they could cause little mischief there."
They began to cause mischief and create destruction in the world.
While there, he causes mischief for the crew and passengers.
Of course, there was no telling how much mischief they could cause if they met up with the wrong human.
Many of those we knew have gone on to cause mischief in the silent lands by now.