形容词
中文翻译：无效的
同义词：
['incompetent', 'ineffective', 'unfit', 'incapable']
例句：
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1. Thedoctor said the patient was invalid for the rest of the day.
医生说病人全天都病了。
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2.The old man couldn't walk because he was invalid.
老人因为身体虚弱而无法行走。
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3. The invalid was moved to a wheelchair by his family.
家人把病人搬到了轮椅上。