A poor piece of work; a lousy or worthless production. Used to disparage something of low quality.
批評家はその映画を駄作だと切り捨てた。
The critic dismissed the movie as a piece of trash.
期待が大きかっただけに、駄作とわかってがっかりした。
Because expectations were high, I was disappointed to find it was a dud.
時には失敗作や駄作も次の良い作品につながることがある。
Sometimes failures or poor works can lead to better works later on.