hesitate: implies pausing before deciding or acting or choosing: ~ed before answering the question.    （pause暂停停顿，表示停下来，之后再继续to stop for a short time before continuing，如Anita paused for a moment, then said: 'All right.'安妮塔略停了一会儿，然后说："好吧。", 如the woman spoke almost without pausing for breath那女人说话很快，如I paused at the door and looked back我停在门口，回头看了看。to give someone pause for thought是固定搭配，表示使某人停下来思考，如the look on her face gave me pause for thought她的表情让我停下来思考）

waver: implies hesitation after seeming to reach a decision and so connotes weakness or a retreat: ~ed in his support of the rebels.


vacillate: implies prolonged hesitation from inability to reach a firm decision and suggests the play of opposing factors that results in indecision: ~ed until it was too late and events were out of control.


falter: implies a wavering or stumbling and often connotes nervousness, lack of courage, or outright fear: never once ~ed during her testimony.


hesitate犹豫迟疑: 指在决定行动选择前停顿，waver动摇: 指看似做出决定后又再次犹豫，显得虚弱和倒退，vacillate犹豫不决: 指长期犹豫无法决定，暗示存在矛盾因素，falter犹豫畏缩: 指动摇蹒跚，显得紧张胆怯害怕


记忆方法: 1）首字母HWVF想成Very Foolish House Wife主妇很傻<==犹豫


         2）犹豫的意思是没决心不确定mean to show irresolution or uncertainty.