The phrase "acted fiercely" is correct and usable in written English.
It can be used to describe someone who is behaving with intensity, aggression, or strong emotion in a particular situation.
Example: "During the debate, she acted fiercely, defending her position with passion and conviction."
Alternatives: "behaved aggressively" or "reacted with intensity."
It was filmed in Savannah and is beautifully shot and fiercely acted.
Mr. Melkaev, a young dancer stepping in for an injured performer, did not always define the choreography's shapes, but his Paul was fiercely acted with a touching, boyish desperation, The same kind of dramatic projection was powerfully channeled into Mr. Ananyan's Favorite, who made him interesting, more brutal than cunning.
But this fiercely acted production under Larry Biederman's direction isn't able to concentrate the energy of this sprawling drama, which dissipates its Oedipal meaning.
Thanks to mythmaking projects like Ayn Rand's "The Fountainhead" and its hero, Howard Roark, architects can play-act at being fiercely individual visionaries.
In the next ten years companies are going to move more quickly, act smarter and battle more fiercely than ever before.
For Vournous, measures would start with a second detention centre but islanders fearful that new facilities will act as a potential magnet have fiercely opposed the proposal.
In a response to the committee (pdf) on Monday, Ofsted said it fiercely guarded its reputation to act "without fear or favour" when inspecting schools.
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The comedy offers a fiercely parodistic TV commercial for "Black Acting School," run by white teachers who instruct black performers how to act like "TV pimps, movie muggers, street punks," and, of course, slaves.
And, emotionally speaking, her opening and final acts do compel far more fiercely than the sunlit plateau that divides them.
