fiercely
助言をしてやろうとしたのに彼は私に向かって猛烈に悪態をつくだけだった。
I tried to give him some advice, but all he did was hurl vicious insults at me.
警官がやってくるのを見ると彼は猛烈に走り出した。
When he saw the police officer coming, he took off running at full speed.