weak, feeble, infirm
这三个词共同的意思是“弱的”。它们的区别是：
weak用于修饰人、人的身体及其各部分器官,为最普通用语; feeble多指体格、脉搏、声音等“虚弱的,无力气的”,语气较weak强且庄重。例如:
Her pulse was very feeble.她的脉搏很微弱。
infirm特指因年老而衰弱。例如:
My grandpa is infirm with age.我祖父年老体衰。
weak，feeble，frail，fragile
这些形容词均有“虚弱的，乏力的”之意。
weak普通用词，指缺乏应有的力量，可用于身体、意志或精神。
feeble指身体衰弱无力，精力几乎耗尽，含令人怜悯的意味。
frail多指因经常生病而身体纤弱。
fragile可与frail换用，但语气强，侧重脆弱，指人容易生病，指物容易破碎。
Swimming is helpful for bones that are porous and weak.
游泳有助于改善骨质疏松和骨骼脆弱。
柯林斯例句
Strong winds can turn boats when the tide is weak.
潮水小的时候强风可以让船只改变航向。
柯林斯例句
The chief editorial writer also blames weak leadership for the current crisis.
首席社论员也把当前的危机归咎于领导层软弱无力。
柯林斯例句
She is still weak after her illness.
她病后仍然虚弱。
《牛津高阶英汉双解词典》
When the economy is weak, it's very hard for suppliers to raise their prices.
经济疲软时供货商很难提价。
柯林斯例句
He was a nice doctor, but a weak man who wasn't going to stick his neck out...
他是位为人和蔼的医生，但胆小怕事，不敢冒什么风险。
柯林斯高阶英语词典
The molecules in regular liquids are held together by relatively weak bonds...
常规液体里分子之间的键合力相对较弱。
柯林斯高阶英语词典
The changes come after mounting criticism that the government is weak and indecisive...
随着对政府软弱和优柔寡断的批评愈演愈烈，情况终于有了变化。
柯林斯高阶英语词典
His weak voice was almost inaudible...
他的声音微弱，几乎听不见。
柯林斯高阶英语词典
She tired easily and had a weak heart.
她很容易疲劳，心脏也不好。
柯林斯高阶英语词典
...a very weak bleach solution.
高度稀释的漂白剂
柯林斯高阶英语词典
...a cup of weak tea...
一杯淡茶
柯林斯高阶英语词典
He managed a weak smile.
他勉强挤出一丝笑容。
柯林斯高阶英语词典
Geography was my weak subject...
地理是我的弱项。
柯林斯高阶英语词典
I was too weak to move or think or speak...
我太虚弱了，无法动弹，无法思考，也无法说话。
柯林斯高阶英语词典
His arms and legs were weak.
他的四肢虚弱无力。
柯林斯高阶英语词典
The claim exposed a weak point in the structure of facts upon which his argument rested...
这一主张暴露了支撑他论点的论据结构的一个弱点。
柯林斯高阶英语词典
The owner said the bird may have escaped through a weak spot in the aviary...
鸟的主人说这只鸟可能是从鸟舍一处不结实的地方逃走的。
柯林斯高阶英语词典
The weak dollar means American goods are relative bargains for foreigners...
美元疲软意味着美国的产品对外国人来说相对便宜。
柯林斯高阶英语词典
Do you think the prosecution made any particular errors, or did they just have a weak case?...
你认为公诉人犯了什么错误呢，还是根本就是证据不足？
柯林斯高阶英语词典
You have been conditioned to believe that it is weak to be scared.
你已经习惯性地认为害怕就是软弱。
柯林斯高阶英语词典
You may very well be asked what your weak points are. Don't try to claim you don't have any...
你很可能会被问到有什么缺点。不要试图声称自己没有任何缺点。
柯林斯高阶英语词典
Until the beating, Cantanco's eyesight had been weak, but adequate...
挨打前坎坦科的视力就一直很弱，不过也还勉强看得见。
柯林斯高阶英语词典
She was a plain-looking woman with a weak chin.
她相貌平平，性格懦弱。
柯林斯高阶英语词典
The council was too weak to do anything about it.
市政会手中无权，对此无能为力。
柯林斯高阶英语词典
In a weak moment (= when I was easily persuaded) I said she could borrow the car.
我一时心软，同意她借用汽车。
牛津词典
That bridge is too weak for heavy traffic.
那座桥不太牢固，承受不住过多的车辆。
牛津词典
His legs felt weak.
他觉得两腿发软。
牛津词典
a weak and cowardly man
一个懦弱胆怯的男子
牛津词典
She suffered from a weak heart.
她心脏不好。
牛津词典
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