1
be unsound
系表结构，描述建筑物或物体损坏、不牢固，或人身体不健康。
The old bridge is unsound and has been closed to traffic.
这座旧桥不牢固，已禁止通行。
不健全的；损坏的；腐烂的
unsoundest — superlative of unsound
先理解核心含义，再看它在真实句子里的用法。
不健全的；损坏的；腐烂的
not in good condition; damaged or decayed
The old bridge is unsound and has been closed to traffic.
这座旧桥不牢固，已禁止通行。
不健全的；不坚实的；不合理的。
Not sound
The old wooden bridge was declared unsound after the flood.
洪水过后，这座旧木桥被宣布为不牢固。
The roof timbers looked solid, but the surveyor found they were unsound.
屋顶的木梁看起来牢固，但验房师发现它们已经损坏。
Do not buy that car; its frame is unsound and will need frequent repairs.
别买那辆车；它的车架不牢固，需要经常修理。
系表结构，描述建筑物或物体损坏、不牢固，或人身体不健康。
The old bridge is unsound and has been closed to traffic.
这座旧桥不牢固，已禁止通行。
定语用法，修饰抽象名词时表示论据、建议等有谬误、不可靠。
The proposal is based on unsound arguments.
该提议建立在站不住脚的论据上。
宾语补足语结构，表示经检查后判定某事物有问题。
The auditors found the company's financial practices unsound.
审计人员发现这家公司的财务做法不健全。
Not this
He gave me an unsound advice.
Use this
He gave me unsound advice.
advice 是不可数名词，不能与不定冠词 an 连用；修饰语后仍应使用零冠词，直接说 unsound advice。
Not this
The unsound of his argument was obvious.
Use this
The unsoundness of his argument was obvious.
unsound 是形容词，不能直接作主语名词；表示“不健全、不牢靠”的名词形式是 unsoundness，因此应说 the unsoundness of his argument。
Focus on the distinctions below. Other candidates are kept compact until a reliable usage note is available.
精神不健全的；心神丧失的
The court ruled that the man was of unsound mind when he signed the contract.
法院裁定该男子签署合同时精神不健全。
不靠谱的建议；错误的意见
My lawyer gave me unsound advice, and I lost the case.
我的律师给了我错误的建议，我输了官司。
结构不牢固的；结构有缺陷的
The old bridge was declared structurally unsound and closed to traffic.
这座旧桥被宣布结构不安全，并已禁止通行。
财务上不健全的；经济上不可靠的
The bank refused to lend money to the financially unsound company.
银行拒绝贷款给这家财务不健全的公司。
谬误的推理；不严密的论证
Your conclusion rests on unsound reasoning.
你的结论建立在谬误的推理之上。
心智不健全的
The court found that he was of unsound mind when he made the will.
法庭认定他立遗嘱时心智不健全。
Use unsoundest naturally, then get feedback on meaning, tone, grammar, and phrasing.
Revisit a common error or keep this word in your review list.
把 sound（健全的）加否定前缀 un-，即“不健全的”；想象苹果烂掉一角就是不 sound 的。
语域：mixed 常见场景：正式书面语与报告、财务评估、技术或医疗描述 该词比较正式，多用于书面或专业语境，日常口语中不算常用。其具体含义随搭配变化，可指“不牢固/已损坏”“财务上不稳健”或“论证不严密”，宜根据上下文判断。
这些词都以 /aʊnd/ 结尾，与 unsound 的重读音节押韵。注意拼写相似的 wound 有两个读音：表示“受伤”时读 /wuːnd/，与 unsound 不押韵；表示“缠绕”的过去式时读 /waʊnd/，才与 unsound 押韵。
Dictionary facts from ECDICT, WIKTIONARY.