The phrase "act brutal" is correct and usable in written English.
It can be used to describe someone behaving in a harsh, cruel, or violent manner.
Example: "In the heat of the moment, he chose to act brutal, showing no mercy to his opponents."
Alternatives: "behave ruthlessly" or "act savagely".
In hockey and soccer, for example, you are told to hate your opponent and act brutal toward him.
"His novels have long been attractive to film-makers," says Field, "for the very primal reason that his work examines our core, the two faces of violence that co-exist in every savage act – brutal strength of purpose holding hands with a desperate and cowering weakness".
Now Takeshi Kitano, a monument of Japanese popular culture in his own right, has taken up Katsu's sword in an act of brutal, loving homage.
Parenthood's feverish early days end in an act of brutal violence, and suddenly the anxieties of fatherhood, race, money are dwarfed by otherworldly peril.
In the psychology laboratory, students, at least in the US, can be persuaded to act like brutal prison guards prepared to inflict intolerable pain on their victims.
"Industrial action for us is the last resort, but we are not going to have employers being able to act in brutal ways and our people not to be able to stand up for themselves.
In return, the stranger wants a list of the nobleman's conspirators, and a partner on a journey of countless acts of brutal violence.
Every fan of the old Hollywood westerns knows that certain crimes — sexual violence against women, the killing of children — justify extreme acts of brutal vengeance.
The cradle and site of adolescent crimes, unconscious acts, and brutal truths that form who we are and the scenes that made Tracey an artist.
But if it's wrong for the right to seek vindication in acts of brutal violence, then it's surely wrong for the left to do the same.
I am alarmed and terrified by the rise of the extreme right in Italy, by intolerance toward foreigners, and by acts of brutal violence perpetrated against them.
