形容词
中文翻译：无用的
同义词：
['useless', 'ineffective', 'unproductive']
例句：
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1. The new software is very unuseful for our business needs.
这款新软件对我们的业务需求毫无用处。
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2. The old car is completely unusable now that the engine has broken down.
这辆旧车现在引擎坏了，完全无法使用。
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3. The advice was completely unuseful to me, as I had already tried everything else.
那建议对我完全没用，我已经试过其他所有方法了。