空前絕後 kōng qián jué hòu

DEFINITIONS

  1. unprecedented and never to be duplicated
  2. the first and the last
  3. unmatched
  4. unique

CHARACTERS

空 kōng
HSK 3
empty, hollow, bare, deserted
前 qián
HSK 1
in front, forward; preceding
絕 jué cut, sever, break off, terminate
後 hòu behind, rear, after; descendents