decorum — OET

decorum

noun

1 he had acted with the utmost decorum:

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:

etiquette, protocol, customary behaviour, good form, custom, convention, conformity, conventionality, usage, ritual;

formalities, niceties, punctilios, politeness;

French politesse;

informal the thing to do;

humorous couth.

decorum Oxford Dictionary of English