形容词
中文翻译：不牢固的
同义词：
['unstable', 'defective', 'frail']
例句：
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1. Theconstruction of the bridge was unsound,leading to its collapse.
桥梁的建设不牢固，导致其崩塌。
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2. The old house isunsound, and it needs immediate repair.
这所老房子不牢固，需要立即修理。
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3. The product quality is unsound, which affects the company's reputation.
产品质量不牢固，影响了公司的形象。