頑強

顽强
wánqiáng
  1. tenacious
  2. hard to defeat

CEDICT

Entry Composition

1 頑 wán
  1. mischievous
  2. obstinate
  3. to play
  4. stupid
  5. stubborn
  6. naughty
2 強 qiáng
  1. strong
  2. powerful
  3. better
  4. slightly more than
  5. vigorous
  6. violent
  7. best in their category, e.g. see 百強 bǎiqiáng