The phrase "act abruptly" is correct and usable in written English.
It can be used to describe someone taking sudden or unexpected action without warning or preparation.
Example: "During the meeting, she decided to act abruptly, leaving everyone in shock."
Alternatives: "respond suddenly" or "react unexpectedly".
Quarterly earnings reports rarely cause him to act abruptly.
The commission should not "act abruptly in areas where we don't have adequate information," he said.
It would seem foolish to act abruptly before that review is completed next year.
But a third act, abruptly shaped as a revenge thriller, forgoes these human virtues for heightened genre exhilaration.
But the Fed also emphasized on Tuesday that it felt no need to act abruptly, and suggested that it might move more cautiously than it did 10 years ago, when the economic cycle was at a somewhat similar stage.
It began with the receipt of a mysterious telegram of bad wishes, and, after a compelling first act, abruptly changed gear and color in the second, with the entrance of an actress wearing a strange and comical hat.
The Bush administration acted abruptly today to hold on to the initiative in the war on terrorism in the face of an aggressive inquiry from Congress and the appearance on Capitol Hill of a high-profile witness to F.B.I. negligence.
The Republican campaign to repeal and replace the Affordable Care Act ended abruptly Friday afternoon.
His mother dead, his father disabled, a college education no more than a fantasy, he resolves to flee town but is implicated in a violent act that abruptly changes the lives of everyone around him.
"We appreciate the court's recognition of the enormous disruption that would have resulted if implementation of the Affordable Care Act was abruptly halted," said Tracy Schmaler, a spokeswoman for the Justice Department.
But he, I think, is very secure in saying we need to get these things right, and if we act too abruptly, we can end up doing more harm than good.
