adjective · ruthless, fierce, or ferocious in nature or action

对待敌人要狠，不能有半点仁慈。

adjective · to suppress one's emotions or harden one's heart to make a difficult decision

他狠了狠心，卖掉了陪伴自己多年的老车。

adverb · determined, resolute, or firm in one's efforts or attitude

我们要狠抓生产安全，绝不能掉以轻心。