weak/feeble/frail.导航词义：虚弱的

1. weak:adj. 虚弱的.最普通用词，使用范围很广，既可指身体虚弱无力的，也可引申用于力量、意志、权力、性格等方面，表示“薄弱的”、“软弱的”等。

Her mother was weak from a long illness.

她母亲长期患病，身体很虚弱。

I'm very weak when it comes to giving up smoking.

在戒烟问题上我意志很薄弱。

The enemy became so weak that they could not go on with the war.

敌人力量变弱，无法再继续这场战争了。

2. feeble:adj. 虚弱的，无力的.语气较 weak 强，尤指身体、脉搏、声音等极为虚弱而无力的。

His pulse was too feeble to feel.

他的脉搏太弱了，摸不着。

The newborn baby gave a feeble cry.

那个新生儿哭声很弱。

Her feeble arm dropped powerless to her side.

她那虚弱的胳臂无力地垂在身边。

3. frail:adj. 虚弱的，瘦弱的.多指因年迈或生病而身体瘦弱的、虚弱的、衰弱的。

The old man is growing thin and frail.

那位老人日渐瘦弱。

She was still feeling a bit frail.

她仍然感觉身体有点虚弱。

Her frail hands could hardly hold a cup.

她虚弱的手几乎连杯子也拿不住。

全部

1·She was born with a weak heart.

她生来就有一个衰弱的心脏。《牛津词典》

2·Geography was my weak subject.

地理课是我的弱项。《柯林斯英汉双解大词典》

3·She was too weak to stand.

她虚弱得站都站不住。《牛津词典》

4·She is still weak after her illness.

她病后仍然虚弱。《牛津词典》

5·His weak voice was almost inaudible.

他声音微弱得几乎听不到。《柯林斯英汉双解大词典》

6·He was a weak little mouse of a man.

他是个懦弱无能的人。《牛津词典》

7·He was weak, cowardly and treacherous.

他软弱、胆怯、奸诈。《牛津词典》

8·The team's weak points are in defence.

这个队的弱点在防守。《牛津词典》

9·He became very weak towards the end of his life.

他临终时很虚弱。《牛津词典》

10·The council was too weak to do anything about it.

理事会软弱无能，对此无能为力。《柯林斯英汉双解大词典》

弱

1·Our core is weak.

我们的核心很弱。

2·So use weak verbs such as appears, seems, could be, etc.

所以要使用弱动词，如 “appear”、“seem”、“could be” 等。

3·It is a kind of hot spring water, which contains the mineral base, to restore and transform it into weak alkaline water.

它是一种温泉水，含有矿物基质，来使它还原转化为弱碱性水。

4·Nor is the global economy forgiving of an American workforce with increasingly weak literacy, math and science abilities.

全球经济也无法容忍美国劳动人口的读写、数学和科学能力越来越弱的现实。

5·It's quite weak, I suppose, but all Carl's stories are very interesting especially because Jim Carrey is a very funny actor.

我认为它很弱，但卡尔的故事都很有趣，尤其是因为金·凯瑞是一个非常有趣的演员。

薄弱的

1·You couldn't maintain all of those weak ties on your own, says Jennifer Golbeck of the University of Maryland.

“靠自己你是无法维持所有那些薄弱的联系的。”马里兰大学的珍妮弗·高尔贝克说。

2·Because of the great weight pressing down on them, these layers tend to fold downward at weak spots, and this finally causes an actual break in the crust.

由于巨大的重量向下压岩层，使它趋于在它的薄弱处向下折叠，这最终导致地壳的实质断裂。

3·Most journals are weak in statistical review, and this damages the quality of what they publish.

数据审查是大多数杂志的薄弱环节，而这会损害出版物的质量。

4·I have searched in vain for a weak performance in these Rouge et Noir sets.

我在《红与黑》中寻找薄弱的表演，但没有找到。

5·Clearly, the problem of weak health systems includes the shortage of human resources as well as issues of infrastructure and financing.

卫生系统的薄弱问题包含了缺少人力资源以及基础设施和筹资问题，这一点十分清楚。

软弱

1·The president says the measure is soft and weak on criminals.

总统说这项措施对罪犯来说太宽容、软弱了。《柯林斯英汉双解大词典》

2·Consensus need not be weak, nor need it result in middle-of-the-road policies.

多数人的意见不一定就软弱，也不一定会导致中立的政策。《柯林斯英汉双解大词典》

3·His shyness made him appear weak.

他的羞怯使他显得软弱。

4·Love makes people strong and at the same time makes people weak.

爱使人坚强，同时也使人软弱。

5·Love is such a thing that it can make us weak and can also make us strong.

爱情是这么种东西，能让我们软弱，也能让我们坚强。

虚弱的

1·She is still weak after her illness.

她病后仍然虚弱。《牛津词典》

2·He became very weak towards the end of his life.

他临终时很虚弱。《牛津词典》

3·Lisa used to be very weak.

丽莎曾经很虚弱。

4·She is not so weak as she looks.

她并不像看上去那么虚弱。《新英汉大辞典》

5·He looked very weak.

他看上去很虚弱。

微弱

1·The Duchess began in a low, weak voice.

公爵夫人用低沉的、微弱的声音说。

2·With a last weak cri-cri-cri, the poor Cricket fell from the wall, dead!

可怜的蟋蟀发出最后一声微弱的 “唧——唧——唧” 的叫声，从墙上摔了下来，死了！

3·Great leaders recognize the weak signals or slight signs that point to big changes to come.

那些预示着巨大变化即将到来的微弱信号或细微迹象，总是能被成功的领导者识别出来。

4·At best there is a weak statistical association and not a causal link between DNA and intelligence.

DNA 和智力之间最多只存在着微弱的统计关联，而不是因果关系。

5·This focusing is the main reason that even relatively weak sounds in the ocean, especially low-frequency ones, can often travel thousands of miles.

正是由于这种集声，即使是海洋中相对微弱的声音，尤其是低频声音，也能传播数千英里。

疲软的

1·Hindered by higher taxes and weak demand for its exports, Mexico's economy is seen only partially recovering this year.

由于高税收和出口需求疲软的阻碍，墨西哥经济今年看来只会部分复苏。

2·In the years that followed, conventional retailers' confidence in the future increased as Census continued to report weak online sales.

在随后的几年里，随着人口普查继续报告网络销售额疲软，传统零售商对未来的信心增加了。

3·A surge in new home sales and a drop in weekly unemployment claims suggest that the economy might not be as weak as some analysts previously thought.

新屋销售激增和每周失业救济人数下降表明，经济可能不像一些分析师此前预期的那样疲软。

4·The researchers argue that weak job markets push more workers into accepting relatively undesirable work at nursing homes, leading to better care for residents.

研究人员认为，疲软的就业市场促使更多的工人接受相对不理想的疗养院工作，从而为居民提供了更好的护理。

5·The dot.com bust discredited most predictions of that sort and in the years that followed, conventional retailers' confidence in the future increased as Census continued to report weak online sales.

网络泡沫的破灭使大多数这类预测变得不可信，在随后的几年里，随着人口普查局持续报告在线销售疲软的情况，传统零售商对未来的信心增强。

脆弱

1·All these make wonderful tools for antisocial people who want to invade weak sites and cause damage.

对于想入侵脆弱站点并造成破坏的反社会人士来说，这些都是极好的工具。

2·This is because the attachment that American Jews feel to Israel is too weak, in most cases, to sway their vote.

这是因为美籍犹太人对以色列的依恋在大多数情况下太过脆弱，以至于无法左右他们的投票。

3·It may not help you tie your shoe but that little plastic tip keeps the rest of the shoelace, the shoe string from unraveling into weak and useless threads.

它可能不能帮你系鞋带，但那小小的塑料头可以让鞋带的其余部分不会散开成脆弱无用的线。

4·Romantic love is not for the weak of heart. It is exhilarating and terrifying all at the same time.

浪漫的爱情不是为脆弱心灵准备的，因为它能够让人同时体会到极大的兴奋和恐惧。

5·That's not easy, because most agile methods of architecture are perceived as weak or disconnected from the ability to deliver value in an enterprise environment.

这并不容易，因为最敏捷的体系结构方法被认为是脆弱的，或者与在企业环境中交付价值的能力不相干。

弱势的

1·Support and affirmation from the weak ties could be the explanation, says Ellison.

埃利森说，其中一种解释可能是来自弱势关系的支持和肯定。

2·And who is the weak group in these countries?

那么谁是这些国家里的弱势群体呢？

3·That is the great work of love among the fellowship of the weak that is the human family.

在弱势群体的团契中，这项伟大的爱的事工，是人类大家庭的彰显。

4·Elsewhere, including in Brazil, growth should remains robust, while in Mexico it is expected to rebound from a weak 2007.

其他国家，包括巴西继续保持强劲增长，同时墨西哥预期将会从2007年的弱势出现回弹。

5·Their core business, sorting out weak or unloved firms, is not enough to feed an industry that grew fat on the boom.

他们的以寻找不受待见的、弱势的公司为核心的业务不足以在繁荣期间支撑整个行业不断向前。

差的

1·My English is so weak.

我的英语很差。

2·She does well in listening, speaking, and reading, but she is weak in writing.

她在听、说、读方面都很好，但写作很差。

3·I am always weak in math in high school, so I think I will choose to major in literature in college.

我在高中数学一直很差，所以我认为我以后大学会选文学专业。

4·They may not have been actually weak but they were poor in expression, with lacy lids that furled down at the corners.

他的双眼可能不是真的视力差，但他眼角的眼睑像花边一样卷起，眼睛很难表达出情绪。

5·Many students entering college have weak skills in mathematics.

许多刚上大学的学生数学能力很差。

(1)weak point弱点（心理或身体上的残疾）；缺点

(1)weak link薄弱环节；弱键

(1)weak force弱作用力；弱核力；弱相互作用

(1)weak acid弱酸

(1)weak rock软弱岩石

(1)weak spot弱点