|im+ noun
Etymology: French or Late Latin; French impropriété, from Late Latin improprietat-, improprietas, from Latin improprius improper + -tat-, -tas -ty — more at improper
1. : the quality or state of being improper
shocked by the impropriety of the young man's action
guilty of impropriety of speech and indecency of dress
saw no impropriety in giving preferment to personal friends and relatives — W.E.Stevens
2. : something improper : an unsuitable or improper act or remark
puns and jokes and pungent improprieties — Times Literary Supplement
specifically : an unacceptable use of a word or of language