形容词
中文翻译：Unknown
同义词：
['uninteresting', 'unexciting', 'uninspiring']
例句：
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1. Thedull music made me want to leave theparty early.
那沉闷的音乐让我想早点离开派对。
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2. She was so dull that she couldn't even recognize her own picture.
她太迟钝了，连自己的照片都认不出来。
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3. The dull weather made outdoor activities difficult.
阴沉的天气使得户外活动变得困难。