1780s, The Newburgh Address (1783) 
Context: There might, Gentlemen, be an impropriety in my taking notice, in this Address to you, of an anonymous production — but the manner in which that performance has been introduced to the Army — the effect it was intended to have, together with some other circumstances, will amply justify my observations on the tendency of that Writing. With respect to the advice given by the Author — to suspect the Man, who shall recommend moderate measures and longer forbearance — I spurn it — as every Man, who regards that liberty, & reveres that Justice for which we contend, undoubtedly must — for if Men are to be precluded from offering their sentiments on a matter, which may involve the most serious and alarming consequences, that can invite the consideration of Mankind; reason is of no use to us — the freedom of Speech may be taken away — and, dumb & silent we may be led, like sheep, to the Slaughter.
                                    
Quotes about impropriety
A collection of quotes on the topic of impropriety, men, act, body.
Quotes about impropriety
                                        
                                        pg 42 
A More Complete Beast (2018)
                                    
1780s, Letter to Reverend Doctor Price (1785)
Source: Outsiders: Studies in the Sociology of Deviance (1963), p. 31.
                                        
                                        Page 229 
2000s, (2008)
                                    
Letter of resignation to Edward Hornor Coates, Chairman of the Committee on Instruction, Pennsylvania Academy of the Fine Arts (1886-02-15).
“I am oppressed with a sense of the impropriety of uttering words on this occasion.”
                                        
                                        Speech at Arlington Cemetery, Decoration Day (30 May 1868) 
1860s 
Context: I am oppressed with a sense of the impropriety of uttering words on this occasion. If silence is ever golden, it must be here, beside the graves of fifteen thousand men, whose lives were more significant than speech, and whose death was a poem, the music of which can never be sung. With words we make promises, plight faith, praise virtue. Promises may not be kept, plighted faith may be broken, and vaunted virtue be only the cunning mask of vice. We do not know one promise these men made, one pledge they gave, one word they spoke: but we do know they summed up and perfected, by one supreme act, the highest virtues of men and citizens. For love of country they accepted death, and thus resolved all doubts, and made immortal their patriotism and their virtue.
                                    
Committee on the Judiary, United States House of Representatives, Plaintiff, v. Donald F. McGahn II, Defendant. (Nov 25, 2019)
“Every mistake made or impropriety suffered, are effective teachings of life.”
                                        
                                        Original: Ogni errore commesso o scorrettezza subita, sono efficaci insegnamenti di vita. 
Source: prevale.net