艰苦卓绝

艱苦卓絕
jiānkǔzhuójué

extremely hard and bitter

Wiktionary

Entry Composition

1 艰苦 jiānkǔ
  1. difficult
  2. hard
  3. arduous
2 卓绝 zhuójué
  1. unsurpassed
  2. extreme
  3. extraordinary