默默无闻

mò mò wú wén

unknown; obscure; working out of the limelight

Character by character

默mò
silent

无wú
without

闻wén
being heard of

她在小山村里默默无闻地教了三十年书。

She taught for thirty years in a small mountain village without anyone hearing of her.

Tone: neutral.

Plain description (他当时还默默无闻) or, as an adverbial with 地, quiet praise for unsung work: 默默无闻地工作, 默默无闻地奉献. The opposite is 大名鼎鼎 (lesson 3-17).

Learn this in Lesson 127 · HSK 7–9: 送别袁隆平 (Obituary: farewell to Yuan Longping)

A dialogue, a reading, word cards with audio and a drill that uses it, in Learn Chinese with Bao. The first lessons of every level are free.