形容词
中文翻译：Unknown
同义词：
['dull', 'unremarkable', 'negligible', 'indistinct', 'subdued例句：1. The painting lacks the luster of a masterpiece.（这幅画缺乏大师作品的光泽。）']
例句：
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1. The painting lacks the luster of a masterpiece.
这幅画缺乏大师作品的光泽。
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2.The sun's rays were unlustrous as it set behind the mountains.
夕阳的光芒在山后显得黯淡无光。
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3.The new paint job on the car is unlustrous compared to the old one.
汽车的新油漆与旧的相比，显得暗淡无光。