General synonyms:
* Excellence
* Goodness
* Morality
* Integrity
* Honesty
* Decency
* Uprightness
* Righteousness
* Rectitude
* Probity
* Character
* Worth
* Merit
More specific synonyms:
* Courage (for bravery and strength of character)
* Temperance (for moderation and self-control)
* Justice (for fairness and equity)
* Wisdom (for knowledge and sound judgment)
* Charity (for kindness and generosity)
* Humility (for modesty and lack of arrogance)
* Patience (for tolerance and endurance)
* Fortitude (for mental strength and resilience)
The best synonym for "virtue" will depend on the specific context and the meaning you want to convey.