Lacking interest, liveliness, or appeal; dull, uninspiring, or tedious, often referring to content, style, or a situation.
这位教授的讲座内容虽然有深度，但表达方式干燥无味，很难吸引住学生。
Although the professor's lecture had depth, the delivery was dry and uninteresting, making it difficult to keep the students engaged.
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