Answer
**Humorous:** Kästner's poems are renowned for their humorous and often satirical nature. His works often blend humor with serious social commentary, addressing themes such as societal issues, politics, and human nature in a lighthearted and witty manner. Kästner's ability to evoke laughter while conveying deeper messages captivates readers and makes his poems enjoyable, thought-provoking, and relatable to a wide audience.