形容词
中文翻译：无成果的
同义词：
['useless', 'fruitless', 'futile例句：1. The project was unfruitful because of the lack of funding.（由于缺乏资金，这个项目是徒劳的。）']
例句：
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1. The project was unfruitful because of the lack of funding.
由于缺乏资金，这个项目是徒劳的。
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2.The farmer's efforts were unfruitful as the weather conditions were not favorable.
农民的努力是徒劳的，因为天气条件不利。
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3.The research was unfruitful as it did not yield any significant results.
这项研究是徒劳的，因为它没有得出任何有意义的结果。