亙古未有 [亘－－－]

Jyutping gang2 gu2 mei6 jau5
Pinyin gèn gǔ wèi yǒu

Definitions (CC-CEDICT)
  1. unprecedented
  2. never seen since ancient times
Definitions (Wiktionary)
  1. phrase, idiomatic
    unprecedented; unheard of; to have never ever occurred
Definitions (Kaifangcidian)
  1. （沒有對應漢語詞彙）