Definition of Decorum: Decorum (noun): Behavior in keeping with good taste and propriety; appropriate conduct or manners. Synonyms: propriety, etiquette, politeness, civility Antonyms: rudeness, impropriety, bad manners, indecorum Memory Tip: Think of “decorum” as the “decoration” of behavior—acting with grace and proper manners, like a well-decorated room that impresses guests. Conversation and Short Story Examples…