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If something is unprecedented, it has never happened before.
unique , unparalleled
Such a move is rare, but not unprecedented.
这样的举动少见，但并非从来没有过。
In 1987 the Socialists took the unprecedented step of appointing a civilian to command the force.
在1987年，社会党人史无前例地任命一名非军队出身的人来领导军队。
If you describe something as unprecedented, you are emphasizing that it is very great in quality, amount, or scale.
The mission has been hailed as an unprecedented success.
这次行动被认为是一次空前的成功。
an instant slaughter unprecedented in the history of mankind.
一场人类历史上空前的即时大屠杀。
雅思英语词汇收录8785个雅思英语词条，基本涵盖了全部常用雅思英语词汇的翻译及释义，是英语学习的有利工具。