General antonyms:
* Vice: This is the most direct and general antonym. Example: "The hero's virtue was tested by the villain's vices."
* Evil: This emphasizes the harmful and destructive nature of the opposite of virtue. Example: "Her actions were driven by pure evil."
* Sin: This is a religious term for an immoral act or a transgression against God's law. Example: "He believed that his actions were a sin against humanity."
* Corruption: This refers to moral decay or the process of becoming immoral. Example: "The politician's corruption led to his downfall."
More specific antonyms:
* Dishonesty: For the virtue of honesty.
* Cowardice: For the virtue of courage.
* Indolence: For the virtue of diligence.
* Injustice: For the virtue of justice.
* Insincerity: For the virtue of sincerity.
The best antonym for "virtue" will depend on the specific meaning you are trying to convey.