Something that has never occurred before; unprecedented.
从来没有过的。
宋·徐度《却扫编》卷下而邓枢密洵武真以少保领院而不兼节钺，前所未有也。”
The company achieved unprecedented success this year.
Learn the next connected idiom: 前所未有 (qián suǒ wèi yǒu) → 有条不紊 (yǒu tiáo bù wěn)
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