cowardly

The cowardly soldier abandoned his post as soon as the enemy fire began.

(Chinese) 敌人的炮火一响，那个胆小的士兵就弃守了他的岗位。

Attacking someone from behind is a cowardly act that demonstrates a lack of integrity.

(Chinese) 从背后袭击他人是一种卑鄙胆小的行为，显示出缺乏正直感。