前所未見

前所未见
qiánsuǒwèijiàn
  1. unprecedented
  2. never seen before

CEDICT

to be unseen; to be unprecedented

Wiktionary

以前所沒有看過或發生過的。

重編國語辭典

Entry Composition

1 前 qián
  1. front
  2. forward
  3. ahead
  4. first
  5. top (followed by a number)
  6. future
  7. ago
  8. before
  9. BC (e.g. 前293年)
  10. former
  11. formerly
2 所 suǒ
  1. actually
  2. place
  3. classifier for houses, small buildings, institutions etc
  4. that which
  5. particle introducing a relative clause or passive

classifier: 個
3 未見 wèijiàn
  1. (literary) to still have not seen
  2. to still have not seen

Related entries

亙古未有 gèngǔwèiyǒu
  1. unprecedented
  2. never seen since ancient times
前所未有 qiánsuǒwèiyǒu (idiom) unprecedented
前無古人 qiánwúgǔrén
  1. (idiom) unprecedented
  2. unheard of
他是一位前无古人的大科学家。

He is as great a scientist as ever lived.

Source: Tatoeba

破天荒 pòtiānhuāng
  1. unprecedented
  2. for the first time
  3. never before
  4. first ever
空前 kōngqián unprecedented
前不見古人，後不見來者 qiánbùjiàngǔrén,hòubùjiànláizhě
  1. unique
  2. unprecedented (idiom)
曠古未有 kuànggǔwèiyǒu
  1. never before in the whole of history (idiom)
  2. unprecedented
曠古未聞 kuànggǔwèiwén
  1. never before in the whole of history (idiom)
  2. unprecedented
  3. also written 曠古未有
未有 wèiyǒu
  1. is not
  2. has never been
  3. never occurring
  4. unprecedented
她等了又等，但他始終未有回來。

She waited and waited, but he never returned.

Source: Tatoeba