noun
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った。
He laughed and called what he had written a trashy book.