cowardice       
noun [ U ] uk/ˈkaʊ.ə.dɪs/ us/ˈkaʊ.ɚ.dɪs/
 怯懦
the behaviour of someone who is not at all brave and tries to avoid danger
  Cowardice prevented me from doing what I knew I should do. 懦弱使我无法做我知道自己应该做的事情。 
 You can accuse me of cowardice, but I still wouldn't fight in a war. 你可以指责我懦弱,但我仍然不会去打仗。 
 See: coward
 - More examples
 - They charged him with showing cowardice in the face of the enemy.
 - The president called the attack "a disgraceful act of cowardice".
 - This was no time for moral cowardice.