Formal:
* The virtuous queen was known for her compassion and fairness.
* His virtuous actions inspired many to follow his lead.
* She was a woman of impeccable character, known for her virtuous conduct.
Informal:
* He tried to act virtuous, but his actions spoke louder than words.
* I wouldn't call myself virtuous, but I do try to be a good person.
* The play explored the conflict between virtuous intentions and flawed actions.
You can also use "virtuous" to describe things besides people:
* The virtuous cycle of nature helps maintain balance in the ecosystem.
* The artist's virtuous use of color created a sense of harmony in the painting.
Remember, "virtuous" often implies a sense of moral righteousness or goodness. Be mindful of the context when using this word.