← BackshareGuessdecorous/ˈdɛkərəs/adjectiveBehaving in a polite, proper, and socially acceptable way.It is important to be decorous at a formal dinner party.The students remained decorous during the principal's speech.Her decorous behavior impressed the interviewers.SynonymsproperpolitedignifiedseemlyAntonymsrudeindecorousimproper