backward/ˈbækwəd/
adj.1. 向后的,倒行的a backward jerk of her head她猛一回头
Without a backward glance, he walked away.他头也不回地走了。
2. 返回的the backward journey回程
3. 落后的The country is still in a backward state.那个国家仍然处于落后状态。
4. 迟钝的;没有自信的;羞怯的a backward pupil智力差的学生
The child was backward in learning to walk.那孩子学步较晚。