形容词
中文翻译：Unknown
同义词：
['stupid', 'foolish', 'uninteresting', 'dull-witted']
例句：
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3.
指人
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1. She has a dull sense of humor.
她幽默感很迟钝。
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2. The book is very dull to read.
这本书读起来非常枯燥。
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3.He was so dull that he couldn't even recognize his own name.
他如此愚笨以至于连自己的名字都认不出来了。