noun
1.
the quality or state of being improper (as in social behavior)
was shocked by the impropriety of their actions
Synonyms: incorrectness, indecorousness, indecorum, inelegance, unbecomingness, unmeetness, unseemliness, untowardness
Related Word: inadmissibility, objectionableness, unacceptableness
Contrasted words: becomingness, decency, decorousness, decorum, meetness
Antonyms: propriety, seemliness
2.
Synonyms: faux pas , blooper, boner, ||boo-boo, break, gaffe, indecorum, solecism; compare error 2
3.
Synonyms: barbarism , corruption, slangism, solecism, vernacularism, vernacularity, vulgarism