你为什么不为自己的辩护？你真是个懦夫！

Why didn't you stand up for yourself? You're such a ___coward!

他总是逃避挑战；他是个彻头彻尾的懦夫。

He always runs away from challenges; he's a total ___coward.

面对危险，懦夫会选择躲藏而不是面对。

Facing danger, a ___coward would choose to hide rather than confront it.