枯燥

In a sentence

• 这本书的内容非常枯燥，我很难坚持读完。

  The content of this book is very boring; it's difficult for me to finish reading it.

  枯燥 is used to describe the characteristic of 'the book's content' being boring and lacking in engagement.

• 经过长时间重复相同的工作，他渐渐感到生活有些枯燥。

  After repeating the same work for a long time, he gradually felt life becoming a bit dull.

  枯燥 is used to express the feeling of 'life' becoming uninteresting due to monotony or repetition.

• 这堂课虽然有些枯燥，但对学习基础知识很有帮助。

  Although this class is somewhat dull, it is helpful for learning basic knowledge.

  枯燥 describes the perception of 'the class' as being unexciting yet beneficial for foundational learning.