Dastardly

The dastardly bully spread false rumors to ruin the reputation of his classmates.

The dastardly act of cheating in exams will not be tolerated in this school.

The bully dastardly tripped the smaller child on the playground.

The villain in the movie had a dastardly plan to take over the world.

The dastardly arsonist set fire to the abandoned building, endangering the lives of nearby residents.

The bully subjected his classmates to dastardly acts of harassment.