worthless book; trashy book
A dismissive term for a book of no literary or intellectual value; often used in self-deprecation or criticism.
こんな駄本を読むくらいなら、寝ていたほうがましだ。
I'd rather sleep than read a worthless book like this.
彼は自分の書いたものを駄本だと言って笑
He laughed and called what he had written a trashy book.
Compound of 駄 (da, 'poor, worthless') and 本 (hon, 'book'). The prefix 駄 is used in many words to indicate inferior quality.