形容词
中文翻译：Unknown
同义词：
['impossible', 'unattainable', 'incapable', 'impracticable']
例句：
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1. The task was so complex that it was unfillable for any human to solve it.
这个任务太复杂了，任何人类都无法解决。
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2. The idea of traveling around the world is unfillable for me.
环游世界的想法对我来说是无法实现的。
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3. The project's scope was too large, making it impossible to fill up all the available time.
这个项目的范围太大了，无法填满所有的可用时间。