Antonyms of noun decorum

1 sense of decorum

Sense 1
decorum, decorousness -- (propriety in manners and conduct)
       Antonym of indecorum (Sense 1)
      => indecorum, indecorousness -- (a lack of decorum)

Synonyms/Hypernyms (Ordered by Estimated Frequency) of noun decorum

1 sense of decorum

Sense 1
decorum, decorousness -- (propriety in manners and conduct)
       => propriety, properness, correctitude -- (correct or appropriate behavior)