indefinite
单词辨析：
指人对某事没有把握的，此时通常作表语；也指某事不明确的。
I am uncertain when he will come.
我不清楚他什么时候来。
He was uncertain about whether to buy the jacket.
他拿不定主意要不要买那件夹克。
It is uncertain whether she will win first place.
她是否会取得第一名还不太清楚。
His uncertain temper made him have few friends.
他的脾气令人捉摸不透，因而没什么朋友。
尤指可以理解为两种或更多意思，因而含糊不清、不明确的。
The minister's answer was highly ambiguous.
该部长的回答十分模棱两可。
Her role in the incident was ambiguous.
她在那次事件中的角色并不明确。
指不确定某事是否为真实的或准确的。
Whether or not he can be elected (as) mayor is arguable.
他是否能被选为市长有待商榷。
It is arguable whether the meeting should have been delayed.
这个会议原本是否应该推迟还是个问题。
指所给的信息、意见、答复等故意含糊其词的。
He was rather equivocal about his working experiences.
他谈到他的工作经历时有点含糊其词。
The answers given by the minister were always equivocal.
那位部长的回答总是模棱两可。
指不确定的、不清楚的或没有明确定义或限定的。
an indefinite number of people
不确定的人数
These terminologies are so indefinite that they are confusing.
这些专门用语很不明确，令人费解。
指提供的信息不够详细或表达的意思不够明确的，也指记忆等不清晰的。
The mayor gave only a vague outline of his employment plan.
市长只是含糊地大致说了一下他的劳动力就业计划。
The two students were vague about why they had been late.
对于为什么迟到，这两名学生含糊其词。
He had a vague recollection that he had put the key in the drawer.
他隐约记得自己把钥匙放在抽屉里了。
相关例句：
The indefinite combination of human fallibility and nuclear weapons will lead to the destruction of nations.
人类的可靠性和核武器这对不稳定的组合将最终导致国家的毁灭。
The trial was adjourned for an indefinite period.
审判被无限期推迟。
The store will be closed for an indefinite period.
这家商店将无限期关闭。
What they desire is the fruits of war and the indefinite expansion of their power and doctrines.
他们想要的是战争的果实以及他们权力和主义的无限扩张。
"a/ an" is the indefinite article," the "is the definite article.
a/an是不定冠词，the是定冠词。
Extend a set there was an indefinite prolongation of the peace talks.
延长一盘比赛的时间和谈被不确定的延长了。