The phrase "act of impropriety" is correct and usable in written English.
It can be used to describe a behavior or action that is considered inappropriate or unethical.
Example: "The committee investigated the allegations of an act of impropriety involving several members."
Alternatives: "instance of misconduct" or "act of wrongdoing."
Within the last two days, nine civil lawsuits have been filed against the sheriff's department by the families of 15 victims, all charging officials with various acts of impropriety.
It was regarded as an act of gross impropriety and he would have been dismissed for it had he not resigned instead.
Attempts to assert that power, however, needn't delve into flawed legal arguments and acts of diplomatic impropriety.
The dossier, published this week by BuzzFeed, alleges that acts of sexual impropriety involving Trump occurred in Moscow, and says there was collusion between the Russian government and the Republican candidate's campaign team.
And while acts of financial impropriety deserve to be criticized, is Apple alone in finding ways to goose the paychecks of its most valued employees, including its CEO?
Wall, James M. (1987) "Allied's Flawed Application of the Act of State Doctrine: Impropriety of the Doctrine in International Finance," Cornell International Law Journal: Vol. 20 : No. 2, Article 1.
I have never known Kavanaugh to act disrespectfully to any woman (or man, for that matter), or to engage in any kind of impropriety, ever.
The national Civil Rights Movement claimed that McCormick had acted with a "conflict of interest" but the Office for the Supervision of Solicitors threw out claims of impropriety after finding the allegations to be unfounded.
The nightlife industry has a weird tendency to act like the TSA and sort people into lines of "male" and "female" so that they're not accused of impropriety.
It gave the appearance of impropriety".
