Virtuous describes someone who behaves in a morally good way - honest, kind, disciplined, doing the right thing even when it's hard. It can sound a bit old-fashioned or very serious, like the word 'virtue' itself, which means moral goodness. You might also hear the phrase 'virtuous circle' (or 'virtuous cycle') - a situation where one good thing leads to another good thing, and so on, getting better and better - the opposite of a 'vicious circle', where bad things keep leading to more bad things.

品德高尚的；有美德的