dastardliness in a sentence

Definition

Dastardliness refers to the quality of being treacherous, cowardly, or maliciously deceitful, especially in betraying others for personal advantage.

His dastardliness was evident when he betrayed his closest friends for personal gain.
The villain's dastardliness shocked the town, leaving everyone questioning their safety.
In the face of adversity, she refused to succumb to dastardliness, choosing honor instead.
The dastardliness of the act was condemned by all, uniting the community in outrage.
They could hardly believe the rumors of his dastardliness, as he had always been seen as a hero.