inflexible: implies rigid adherence or even slavish conformity to established principle: ~ in her demands.    （slavish盲从没有创意主见to follow or copy without original ideas，来自slave奴隶，如a slavish adherence to the rules墨守成规）


inexorable: implies relentlessness of purpose or ruthlessness or finality or, especially when applied to things, inevitableness: the ~ path of progress.   （finality最终的不能改变的being final and impossible to change，如we have to accept the finality of death我们必须接受死亡的不可改变性,固定搭配to say something with finality表示已经下决定，不想再讨论了，如there was a note of finality in his voice他的话斩钉截铁）


obdurate: stresses hardness of heart and insensitivity to appeals for mercy or the influence of divine grace: an ~ governor who refused to grant clemency.  （grace除了表示动作优雅attractive and well-controlled movement外，还表示上帝或胜利者的恩典或宽大willingness to grant favor or make concessions，如新约new testament最后一句是the grace of the Lord Jesus be with all the saints. 愿主耶稣的恩典与众圣徒同在，如the victor's grace in treating the vanquished胜利者宽大地对待被征服者；还表示宽限期，如they've given me a month's grace to pay the debt他们给我一个月宽限期还债）


adamant: suggests extraordinary strength of will and suggests utter immovability in the face of all temptation or entreaty: was ~ that the project be completed on time.   (entreat请求to ask or request urgently，一般指请求别人改变主意，如entreated him to change his mind请求他改变主意)


inflexible坚持: 指十分严格甚至盲目地遵守原则，inexorable不可改变: 指目标坚定不讲情不改变难避免，obdurate执拗无情: 强调心肠硬, 不仁慈不宽大，adamant坚持: 表示意志坚定, 不为请求或诱惑所动


记忆方法: 1）首字母IIOA中的AI想成爱OI想成老想法Old Idea<==执意


         2）执意的意思是不愿改变既定路线目标mean unwilling to alter a predetermined course or purpose.   alter小改动，大改动是change