noun, plural improprieties for 4, 5.
the quality or condition of being improper; incorrectness.
inappropriateness; unsuitableness.
unseemliness; indecorousness.
an erroneous or unsuitable expression, act, etc.
an improper use of a word or phrase.

1605–15; < Late Latin improprietās. See im-2, propriety Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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World English Dictionary
impropriety (ˌɪmprəˈpraɪɪtɪ)
n , pl -ties
1.  lack of propriety; indecency; indecorum
2.  an improper act or use
3.  the state of being improper

Collins English Dictionary - Complete & Unabridged 10th Edition
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Example sentences
Avoid even the appearance of impropriety with students, even if it means you
  have to be somewhat aloof towards them.
As they were not independent from each other, there was the appearance of
  impropriety and conflict of interest.
Accounting impropriety may conceal those errors, for a time, but is hardly ever
  the main cause.
The students didn't seem to understand the impropriety of their language in
  those situations, since no one taught them.
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