1. to behave in a respectable, proper, or morally acceptable manner
He finally decided to act decently and apologize for his mistakes.
Ele finalmente decidiu agir decentemente e pedir desculpas por seus erros.
2. to conduct oneself with dignity and consideration for others
If you want to be accepted in society, you need to act decently.
Se você quer ser aceito na sociedade, precisa agir decentemente.