副词
中文翻译：无意义地
同义词：
['unknowingly', 'aimlessly']
例句：
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1.He blankly stared at the wall for a long time before he spoke.
他茫然地看着墙，然后才说话。
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2.She blankly looked at the clock as she waited for her friend to arrive.
她茫然地看着时钟，等待朋友的到来。
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3. The scientist blankly stared at the computer screen, not sure what to do next.
科学家茫然地看着电脑屏幕，不知道下一步该做什么。