形容词
中文翻译：无效的
同义词：
['imperfect', 'ineffective', 'inefficient']
例句：
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1. The plan was ineffectual because it did not take into account the potential risks.
这个计划是无效的，因为它没有考虑到潜在的风险。
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2. The new software is ineffectual for this task, as it does not have the necessary features.
这款新软件对于这项任务来说是不有效的，因为它缺少必要的功能。
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3. The manager's suggestion was ineffectual, as it did not solve the problem.
经理的建议是无效的，因为它没有解决问题。