1. conduct that is dignified, polite, and socially appropriate; behavior that conforms to accepted standards of propriety and good manners
The ambassador maintained decorous behavior throughout the formal dinner.
O embaixador manteve um comportamento decoroso durante todo o jantar formal.
2. proper and respectable demeanor, especially in formal or official settings
Her decorous behavior earned her respect among her peers.
Seu comportamento decoroso lhe rendeu respeito entre seus colegas.