ferocious, fierce, furious, savage
Meaning: marked by extreme and violent energy; "a ferocious beating"; "fierce fighting"; "a furious battle"
fierce, tearing, vehement, violent, trigger-happy
Meaning: marked by extreme intensity of emotions or convictions; inclined to react violently; fervid; "fierce loyalty"; "in a tearing rage"; "vehement dislike"; "violent passions"
cutthroat, fierce, bowelless
Meaning: ruthless in competition; "cutthroat competition"; "bowelless readiness to take advantage"
'Cheer,' said Robert in a fierce whisper.
Wild war-whoops and fierce yells rent the air.
But now the fierce horde becomes still fiercer.
It was Mr. Fisher, and he was very hungry and fierce.
It was not a battle so much as a series of fierce duels.
Erech was thus freed from the oppression of its fierce enemy.
But a fierce waft of smoke and hot air made him shut it again.
"I, the brave Little Wound, to-day kill the only fierce enemy!"
She strangled a fierce tide of feeling that welled up within her
Then armed warriors sprang up, a fierce battle cry upon their lips.