默默无闻

默默無聞
mòmòwúwén
(idiom) unknown; unrenowned

CEDICT

Entry Composition

1 默默 mòmò in silence; not speaking
2 无 wú
  1. not to have
  2. no
  3. none
  4. not
  5. to lack
  6. un-
  7. -less
3 闻 wén
  1. to hear
  2. news
  3. well-known
  4. famous
  5. reputation
  6. fame
  7. to smell
  8. to sniff at