n./adj. 平淡无奇，无光泽（的）；暗淡（的）；无生气（的）

The movie's plot was lackluster, failing to engage the audience.
这部电影的情节平淡无奇，无法吸引观众。
The presentation lacked any real enthusiasm or spark.
这次演讲毫无热情或活力。
Her artwork is consistently lackluster, with no unique style.
她的作品总是缺乏个性，没有独特的风格。
The restaurant's food was lackluster; it failed to impress us.
餐厅的食物乏善可陈，没有给我们留下深刻印象。
His performance in the game was lackluster, as he scored only one goal.
他在比赛中的表现平庸，只进了一个球。
The company's financial report was lackluster, causing investors to lose confidence.
公司的财务报告乏善可陈，让投资者失去了信心。
The vacation was lackluster due to constant rain and bad weather.
因为持续下雨和糟糕的天气，这次假期变得索然无味。
The book's writing was lackluster, making it difficult to stay engaged.
这本书的写作平庸，让人难以保持阅读兴趣。
Her acting skills were lackluster, which detracted from the overall quality of the play.
她的演技平庸，影响了整个剧目的质量。
The new smartphone model lacks innovation, leaving much to be desired.
新款智能手机缺乏创新，令人失望。