peremptorily

They had barely arrived when they were peremptorily ordered by a no-nonsense state policeman to turn around and leave the area immediately.

His mother had tried to impose strict rules of behavior on the teen, but he told her peremptorily, "Hands off my life; I’ll live it however I want!"

According to Article V, if two-thirds of states apply for a convention to propose a constitutional amendment, Congress is peremptorily required to call one.