Noah Webster
Impropriety
IMPROPRI'ETY, noun [Latin improprius. See Improper.]
1. Unfitness; unsuitableness to character, time, place or circumstances; as impropriety of behavior or manners. Levity of conduct is an impropriety in a religious assembly and at a funeral. Rudeness or forwardness in young persons before their superiors, is impropriety Indecency and indecorum are improprieties.
2. Inaccuracy in language; a word or phrase not according with the established usages or principles of speaking or writing.
Many gross improprieties, however authorized by practice, ought to be discarded.