(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 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 opposite sound
Idioms
of unsound mind
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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）