unsound

adjective

/ˌʌnˈsaʊnd/

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(of a building, etc.建筑物等) in poor condition; weak and likely to fall down破旧的；摇摇欲坠的
- The roof is structurally unsound.这屋顶结构不牢固。
not acceptable; not based on reliable evidence不稳妥的；观点不正确的
- ideologically unsound意识上不妥
- The use of disposable products is considered ecologically unsound.使用一次性产品被认为是没有顾及对生态的影响。
- This line of argument is unsound.这种论点是站不住脚的。
containing mistakes; that you cannot rely on有错误的；靠不住的 synonym unreliable
- The methods used were unsound.所使用的方法不可靠。

opposite sound

Idioms

of unsound mind

(law法律) not responsible for your actions because of a mental illness精神失常，神志不清（无须对自己的行为负责）