形容词
中文翻译：不稳固的
同义词：
['unstable', 'defective', 'faulty']
例句：
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1.The old building was unsound and had to be torn down.
那座旧建筑不稳固，不得不拆除。
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2. The car's engine is unsound; it needs repairing.
这辆车的引擎不牢固，需要修理。
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3. The bridge is unsound and poses a risk of collapse.
这座桥不牢固，存在坍塌的风险。