堅韌不拔

坚韧不拔
jiānrènbùbá
firm and indomitable (idiom); tenacious and unyielding

CEDICT

firm and indomitable; persistent and dauntless; persevere in tenacious efforts

Wiktionary

形容意志堅強，不可動搖。

重編國語辭典

Entry Composition

1 堅韌 jiānrèn
  1. tough and durable
  2. tenacious
2 不 bù
  1. no; not so
  2. (bound form) not; un-
3 拔 bá
  1. to pull up
  2. to pull out
  3. to draw out by suction
  4. to select
  5. to pick
  6. to stand out (above level)
  7. to surpass
  8. to seize