Final answer:
In the given text, 'vengeful' means having a strong desire for revenge or seeking revenge against someone or something. It suggests that virtuous people may seek revenge as a way to cope with the constraints they face and express their frustration.
Step-by-step explanation:
In the given text, the word 'vengeful' means having a strong desire for revenge or seeking revenge against someone or something. It implies a desire to retaliate or cause harm to those who have wronged you. In this context, 'vengeful' suggests that virtuous people may seek revenge as a way to cope with the constraints they face and to express their frustration or dissatisfaction.