Examples from the Web for improper
Farrell issued a ticket to an 18-year-old shipyard worker for speeding and an improper exhaust mechanism, according to the TP.
And if any police were warning bars against serving the Santas, “that would be improper behavior by a government official.”Before the Bros, SantaCon Was as an Anti-Corporate Protest|David Freedlander|December 12, 2014|DAILY BEAST
I feel sorry because (patients) got the surgery with improper devices, so they might suffer from it.
It could be that those downstream abnormalities in cell development were due to improper signaling from the cerebellum.
Improper burial, Dove says, could mean that harmful bacteria are leeching into the waterways.Aporkalypse Now: Pig-Killing Virus Could Mean the End of Bacon|Carrie Arnold|August 20, 2014|DAILY BEAST
Every idea of prevention was rejected, as conveying an improper suspicion of the ministers of the crown.
There is yet another reason for which it is improper to admit such evidence as this bill has a tendency to promote.The Works of Samuel Johnson, Vol. 11.|Samuel Johnson
He would like to have told Miss Pritchet so, only that would have been improper.Some Little People|George Kringle
The effect of this alteration would be to remove also the useless and improper restriction on the sale of game.
I can think of no other expedient to prevent his engaging in some rash and improper attempt; therefore I beseech you to go down.'Emmeline|Charlotte Turner Smith
British Dictionary definitions for improper
Word Origin and History for improper
mid-15c., "not true," from French impropre (14c.), from Latin improprius, from assimilated form of in- "not, opposite of" (see in- (1)) + proprius (see proper). Meaning "not suited, unfit" is from 1560s; that of "not in accordance with good manners, modesty, decency" is from 1739. Related: Improperly (late 14c.).