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suffer from deafness
suffer from 后接疾病或症状；此结构中 deafness 多作不可数名词。
Many older people suffer from some degree of deafness.
许多老年人患有某种程度的耳聋。
耳聋；聋
deafnesses — plural of deafness
先理解核心含义，再看它在真实句子里的用法。
耳聋；聋
partial or complete loss of hearing
Many older people suffer from some degree of deafness.
许多老年人患有某种程度的耳聋。
耳聋；听力缺失或丧失。
The condition of being deaf; the lack or loss of the ability to hear.
对某一问题或议题缺乏了解或拒绝承认。
Lack of knowledge or refusal to admit a particular problem, issue, etc.
His deafness made it difficult for him to hear the doorbell.
他的耳聋使他很难听到门铃声。
Modern hearing aids can help people cope with deafness.
现代助听器可以帮助人们应对耳聋。
She studied medicine to find ways to prevent deafness.
她学医是为了寻找预防耳聋的方法。
suffer from 后接疾病或症状；此结构中 deafness 多作不可数名词。
Many older people suffer from some degree of deafness.
许多老年人患有某种程度的耳聋。
用 in 短语指出耳聋发生的具体部位，如 left ear、right ear。
He has partial deafness in his left ear.
他的左耳有部分耳聋。
cause 是及物动词，直接以 deafness 作宾语，表示“导致耳聋”。
Loud noise can cause deafness.
巨大的噪音可能导致耳聋。
Not this
The old man is deafness.
Use this
The old man is deaf.
deafness 是名词，表示“耳聋”这种状况，不能跟在 is 后面作表语形容词；描述某人“聋的”应用形容词 deaf。
Not this
He has a deafness in both ears.
Use this
He has deafness in both ears.
deafness 表示“耳聋”时通常为不可数名词，前面不加不定冠词 a/an。
Not this
He suffers deafness.
Use this
He suffers from deafness.
表示“患……病/受……之苦”时，suffer 是不及物动词，须搭配介词 from 才能接 deafness 这类名词。
Focus on the distinctions below. Other candidates are kept compact until a reliable usage note is available.
部分耳聋
He wears a hearing aid because of partial deafness.
由于部分耳聋，他戴着助听器。
完全失聪
The accident left her with total deafness.
那场事故使她完全失聪。
先天性耳聋
Congenital deafness can often be detected in early childhood.
先天性耳聋往往在幼儿期就能被检测出来。
感音神经性耳聋
Sensorineural deafness results from damage to the inner ear or auditory nerve.
感音神经性耳聋由内耳或听神经损伤引起。
患耳聋；失聪
Many older people suffer from some degree of deafness.
许多老年人有一定程度的耳聋。
选择性失聪，装聋作哑
My dad has selective deafness whenever I ask to borrow the car.
我爸爸每当我要借车时就选择性失聪。
执意充耳不闻，故意装聋
The company's willful deafness to customer complaints led to its decline.
公司对顾客投诉的执意充耳不闻导致了它的衰落。
外交式装聋作哑
His diplomatic deafness helped him avoid answering the reporter's awkward questions.
他的外交式装聋作哑让他避开了记者尴尬的提问。
失明使人远离事物；失聪使人远离人群。
This famous saying about deafness is attributed to Helen Keller, the American author and activist who was both blind and deaf, and it emphasizes that hearing loss can cut people off from one another.
这句关于失聪的名言出自美国作家兼活动家海伦·凯勒，她既失明又失聪；这句话强调的是听力丧失会让人与人之间失去联系。
Use deafnesses naturally, then get feedback on meaning, tone, grammar, and phrasing.
Revisit a common error or keep this word in your review list.
把 deafness 拆成 deaf（聋的）+ ness（名词后缀），联想聋人用手语交流，deafness 就是听不见声音的状态。
语域：neutral 常见场景：医疗诊断、健康科普、正式讨论 deafness 是中性且偏正式的通用词，多用于医疗、健康科普或正式讨论中表示“耳聋；失聪”。日常口语里更常说 hearing loss 或直接用 deaf，但指这种状态本身时，deafness 是比较常见于书面和正式场合的说法。
没有常见完全同韵词。注意拼写易混词：deftness（/ˈdɛftnəs/）和 deadness（/ˈdɛdnəs/）形似 deafness，但分别有 /t/ 和 /d/，不押韵；deaf 和 deafen 只共享开头的 /dɛf/；freshness 和 sadness 仅与 deafness 共享 -ness 后缀，元音或辅音不同。
Dictionary facts from ECDICT, WIKTIONARY.