傑作だ

it's a masterpiece

→ 傑作
phrase Rare #24,048
it's a masterpiece Used to praise something as an excellent or outstanding work. Depending on context and tone, it can also be used sarcastically to mean “that's rich” or “that's hilarious.”
JA: この絵は本当に傑作だ。
EN: This painting is truly a masterpiece.

傑作だ

It's a masterpiece.

— グッドフェローズ (1990)

まさに傑作だ

It’s truly a masterpiece.

お前は傑作だ

You're a piece of work.

— グッドフェローズ (1990)

そりゃ傑作だ

That's rich.

— いまを生きる (1989)

この話は傑作だ

This story is a masterpiece.

それらはヨーロッパ芸術偉大な傑作だ

They are great masterpieces of European art.