unprecedented success (前例のない成功)
It was "an unprecedented success" upon its release.
Since 2015, the club has seen unprecedented success at U21 and Minor level.
Dixon reluctantly agreed, and the unprecedented success of the film made him rich.
unprecedented move (前例のない動き)
In an unprecedented move, Chief Justice Mohammad Fazlul Karim declined to swear him in.
The revelation was an unprecedented move, as CFL teams had previously kept their negotiation lists secret.
In an unprecedented move, the drafters required a popular referendum on the draft prior to the king's approval.