Synonyms of decorum in English:

decorum


See definition of decorum

noun

1‘he had acted with the utmost decorum’

SYNONYMS
propriety, properness, seemliness, decency, decorousness, good taste, correctness, appropriateness, appropriacy
politeness, courtesy, good manners
refinement, breeding, deportment, dignity, respectability, modesty, demureness
ANTONYMS

impropriety

2‘a breach of decorum’

SYNONYMS
etiquette, protocol, customary behaviour, good form, custom, convention, conformity, conventionality, usage, ritual
formalities, niceties, punctilios, politeness
politesse
informal the thing to do
humorous couth