Webster's English Dictionary

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impropriety

im.pro.pri.ety \.im-p(r)*-'pri--*t-e-\ n [F or LL; F improprie`te`, fr. LL 
   improprietat-, improprietas)X, fr. L improprius 1: the quality or state of 
   being improper  2: an improper or indecorous act or remark; specif : an 
   unacceptabl e use of a word or of language