An unsuccessful work, product, or project — a flop or dud that failed to meet expectations or performed poorly.
あの映画は大予算だったが、結局失敗作だと批評家に言われた。
That movie had a big budget, but critics ultimately called it a flop.
新製品のデザインに問題があって、発売から半年で失敗作だと判断された。
There were design problems with the new product, and within six months of its release it was judged a failure.
自分の絵を見て『これは失敗作だ』と感じることもあるが、次に活かせる。
Sometimes I look at my drawing and feel 'this is a failure,' but I can use it to improve next time.