堅持不懈

坚持不懈
jiānchíbùxiè
(idiom) to persevere unremittingly; to keep going until the end

CEDICT

Entry Composition

1 堅持 jiānchí
  1. to persevere with
  2. to persist in
  3. to insist on
2 不懈 bùxiè
  1. untiring
  2. unremitting
  3. indefatigable