ferocity
/fəˈrɒsətɪ/noun
(pl. -ies)［mass noun］
- the state or quality of being ferocious凶恶; 凶猛; 残忍：
the ferocity of the storm caught them by surprise
这场风暴来势凶猛, 使他们大为吃惊
count noun she hated him with a ferocity that astonished her.她恨他, 其凶神恶煞的程度连她自己也感到惊讶。
词源
mid 16th cent.: from French, or from Latin ferocitas, from ferox, feroc - 'fierce'.