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suffer from infirmity
suffer from 后接 infirmity 时，infirmity 多作不可数名词，泛指身体虚弱、衰弱。
Many older people suffer from some degree of infirmity.
许多老年人都有一定程度的身体虚弱。
虚弱；体弱；衰弱
infirmities — plural of infirmity
先理解核心含义，再看它在真实句子里的用法。
虚弱；体弱；衰弱
the state of being weak in health or body, especially from old age
Many older people suffer from some degree of infirmity.
许多老年人都有一定程度的身体虚弱。
虚弱、衰弱或疾病,尤指因年老所致。
Feebleness, frailty or ailment, especially due to old age.
身体虚弱的状态(尤指因年老)
the state of being weak in health or body (especially from old age)
道德上的弱点或缺陷。
A moral weakness or defect.
After years of good health, his grandfather's growing infirmity made it hard for him to walk to the shop.
在多年健康之后，他祖父日益加重的虚弱使他很难走到商店。
She refused to let old-age infirmity stop her from gardening every morning.
她拒绝让老年体弱阻止她每天早晨做园艺。
The doctor said that regular exercise could slow the infirmities that often come with aging.
医生说，经常锻炼可以减缓常常随衰老而来的各种身体衰弱。
suffer from 后接 infirmity 时，infirmity 多作不可数名词，泛指身体虚弱、衰弱。
Many older people suffer from some degree of infirmity.
许多老年人都有一定程度的身体虚弱。
此搭配常用复数，指老年期各种衰弱症状的统称。
The hospital has a ward for the infirmities of old age.
这家医院有一个治疗老年期衰弱的病房。
owing to 较正式，infirmity 在此作不可数名词，用作介词宾语表示原因。
He took early retirement owing to infirmity.
他因体弱而提前退休。
Not this
My grandfather is very infirmity.
Use this
My grandfather is very infirm.
infirmity 是名词，表示“虚弱”的状态；在系动词 is 后作表语描述人“身体虚弱的”时要用形容词 infirm。把名词误当形容词用是常见的词性混淆错误。
Not this
Old people often have many infirmitys.
Use this
Old people often have many infirmities.
infirmity 的复数形式是以辅音字母加 y 结尾，变 y 为 i 再加 es，即 infirmities，不能直接加 s 写成 infirmitys。
Focus on the distinctions below. Other candidates are kept compact until a reliable usage note is available.
身体虚弱
Physical infirmity did not prevent her from living independently.
身体虚弱并未妨碍她独立生活。
老年体弱
The clinic treats many of the infirmities of old age.
这家诊所治疗许多老年体弱之症。
年老体衰
Age and infirmity had slowly eroded his independence.
年老体衰逐渐侵蚀了他的独立生活能力。
身患虚弱之症
She suffers from an infirmity that affects her hands.
她患有一种影响双手活动的虚弱症。
因体弱
He retired from his post due to infirmity.
他因体弱而退休离职。
意志薄弱；优柔寡断
His infirmity of purpose kept him from ever taking a decisive stand.
他意志薄弱，始终无法果断表明立场。
我为基督的缘故，就以软弱、凌辱、急难、逼迫、困苦为可喜乐的；因我什么时候软弱，什么时候就刚强了。
In his second letter to the Corinthians, the apostle Paul says that God's power is made perfect in weakness, so he can even rejoice in his infirmities.
使徒保罗在给哥林多人的第二封信中说，神的能力在人的软弱上显得完全，所以他甚至能因自己的软弱而喜乐。
他代替我们的软弱，担当我们的疾病。
The Gospel of Matthew quotes Isaiah to describe how Jesus healed the sick, taking their infirmities upon himself.
马太福音引用以赛亚的话，描述耶稣如何医治病人，把他们的软弱担在他自己身上。
Use infirmities naturally, then get feedback on meaning, tone, grammar, and phrasing.
Revisit a common error or keep this word in your review list.
in-（不）+ firm（稳固）+-ity（状态）：身体不够firm，就是虚弱。想象老人拄拐，脚步不稳。
语域：formal 常见场景：formal writing、medical text、literature infirmity 比较正式，多用于书面语或医疗、文学语境；日常口语中更常说 weakness 或 frailty。
infirm, firm, term, confirm 都含有 /ɝm/ 音，与 infirmity 中重读的 /fɝm/ 相同，但它们不是整词押韵，因为 infirmity 后面还有 /ɪti/。enmity 和 calamity 拼写以 -mity 结尾，但读音分别是 /ˈɛnməti/ 和 /kəˈlæməti/，与 /ˈfɝmɪti/ 不同，不要按拼写类推。
Dictionary facts from ECDICT, WIKTIONARY.