unprecedented
adjective uk/ʌnˈpres.ɪ.den.tɪd/ us/ʌnˈpres.ə.den.t̬ɪd/
C2 史无前例的，空前的;绝无仅有的
never having happened or existed in the past
This century has witnessed environmental destruction on an unprecedented scale. 环境在本世纪遭到了空前的破坏。
- More examples
- She took the unprecedented step of revealing the truth about the situation.
- Such an event was unprecedented in the 20th century.
- Unemployment has reached an unprecedented level.
- This situation is unprecedented in 21st-century life.
- Crime has risen on an unprecedented scale.