Breadcrumb Home > Thesaurus > D Synonyms of decorum Find synonyms for: Noun1. decorum, decorousness, propriety, properness, correctitudeusage: propriety in manners and conductWordNet 3.0 Copyright © 2006 by Princeton University. All rights reserved.Definition and meaning of decorum (Dictionary) ✖ Related Content Daily Word Quiz: tautology Analogy of the Day: Today’s Analogy Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language