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Jyutping hung1 cin4 zyut6 hau6
Pinyin kōng qián jué hòu

Definitions (CC-CEDICT)
  1. unprecedented and never to be duplicated
  2. the first and the last
  3. unmatched
  4. unique
Definitions (粵典–words.hk)
  1. 形容詞
    之前​未發​生過​,​之後亦​唔​會​再​發生​;​形容​某​啲​正面​嘅​嘢​非常​之​出眾​。
    unprecedented and unrepeatable (in a positive way)
    • 呢場演唱會 真係好精彩,可以話係空前絕後。
      呢场演唱会 真系好精彩,可以话系空前绝后。
      nei1 coeng4 jin2 coeng3 wui2 zan1 hai6 hou2 zing1 coi2,ho2 ji5 waa6 hai6 hung1 cin4 zyut6 hau6。
      This concert was absolutely spectacular, and quite possibly unprecedented and unrepeatable.
Definitions (Wiktionary)
  1. phrase, idiomatic
    unprecedented and never to be duplicated; the first and the last; unmatched; unique
Definitions (Kaifangcidian)
  1. (沒有對應漢語詞彙)
Examples (粵典–words.hk)
  1. Cantonese
    空前绝后
    空前絕後
    hung1 cin4 zyut6 hau6
    • unprecedented and unrepeatable (in a positive way)
  2. Cantonese
    呢场演唱会 真系好精彩,可以话系空前绝后。
    呢場演唱會 真係好精彩,可以話係空前絕後。
    nei1 coeng4 jin2 coeng3 wui2 zan1 hai6 hou2 zing1 coi2,ho2 ji5 waa6 hai6 hung1 cin4 zyut6 hau6。
    • This concert was absolutely spectacular, and quite possibly unprecedented and unrepeatable.