The phrase "abrupt act" is correct and usable in written English.
It can be used to describe an action that is sudden and unexpected, often without warning or preparation.
Example: "The abrupt act of quitting his job left everyone in shock."
Alternatives: "sudden action" or "unexpected move".
His abrupt acts and swerving meditations have an air of unplotted inevitability about them.
Unsettling details accumulate and spill over into abrupt acts of intrafamilial aggression: a boy suddenly muffling his sister into silence, a daughter violently jerking her mother's wheelchair.
The first is that these offhand and abrupt acts of canine disregard are examples of the slightly anti-social lack of sentimentality that runs through all of Anderson's work.
"We certainly make note of the assurances of our American colleagues that they have constantly tried to keep the Georgian leadership from abrupt acts, but the chronology was the way I have just explained: A visit to Washington, NATO's decision, the taking of hostages," Mr. Lavrov said.
As a member of a gang, they are then forced to commit unspeakable and abrupt acts of violence against rival gang members, adding years or even decades to their original sentence.
Under the control of ecdysone, Chinmo and Abrupt control the differentiation of the gonadal soma specifically in one sex: Abrupt acts in the germarium and Chinmo in testis (Jang et al. 2009; Flaherty et al. 2010).
The main issue, in the grim, rubbish-strewn naturalism of the film, is Jérémie Renier's overwrought performance and the abrupt third act reveal that he delivers.
Yet to Mr. Tucker, 38, the manic, motor-mouth comic and actor who ascended from the low-budget comedy "Friday" to the blockbuster "Rush Hour" franchise before an abrupt vanishing act, the four years that have elapsed since his last substantial screen appearance have gone by in no time at all.
"They cut it off with the murders, and the ending doesn't reflect properly on what was done by (UMW reform president) Arnold Miller and (Jock Yablonski's attorney) Joseph Rauh, who--at considerable risk to themselves--carried on my father's work". The current UMW administration also is displeased with what it considers the abrupt way "Act of Vengeance" ends.
