你不敢跟她说话？你这个懦夫！

You didn't talk to her? You ___coward!

我没有表现得像个明智的成年人，反而表现得像个懦夫。

Instead of behaving like a wise grown-up, I behaved like a ___coward.

他因为拒绝参加抗议而被称作懦夫。

He was called a ___coward for refusing to join the protest.