衰弱的英文：
weak
feeble

参考例句：

Diurnally becoming debilitated
日趋衰弱

She became weak.
她变得衰弱了。

The state of being weak or feeble;infirmity.
衰弱虚弱或无力的状态;体弱

Infirm,feeble,and often senile.
蹒跚的虚弱的，衰弱的，因老而糊涂的

Myasthenia gravis： Chronic autoimmune disease causing muscle weakness.
重症肌无力:一种引起肌肉衰弱的慢性自体免疫疾病。

To sap the strength or energy of;enervate.
使衰弱削弱…的力量或精力;使衰弱

Faint:Lacking strength or vigor; feeble.
衰弱的:缺乏力气或活力的;衰弱的

She was fainting with hunger.
她因饥饿而渐渐衰弱。

The kingdom's power declined.
王国的势力衰弱了。

She is fading away, losing strength
她渐渐衰弱了。

weak是什么意思：
adj. 疲软的；虚弱的；软弱的；愚钝的；不牢固的；淡薄的

a weak radio signal; a weak link.
微弱的无线电信号；薄弱的连接。

He has weak eyes.
她的视力不佳。

The spirit is willing But the flesh is weak
力不从心。

Alternate weakness with severity
恩威并济

There is an inherent weakness in the design.
这设计本身存在弱点。

feeble是什么意思：
adj. 虚弱的，无力的；懦弱的，薄弱的

This is a feeble argument.
这是一场无益的争执。

It's a feeble excuse.
这是一个软弱无力的借口。

This is a particularly feeble argument.
这个论点尤其薄弱。

Infirm,feeble,and often senile.
蹒跚的虚弱的，衰弱的，因老而糊涂的

damning with faint praise; faint resistance; feeble efforts; a feeble voice.
用虚假的赞美来诅咒；微弱的抵抗；微弱的努力；微弱的声音。