unsung

adj

1. (not-comparable)Which has not been lauded or appreciated.

   “The backstage crew of the movie were the unsung heroes.”

   “Only when one has seen a Control Office at first-hand does one realise the vast amount of unsparing but largely unsung work that is behind the eventual publication, perhaps, of a paragraph in this journal's "Motive Power Miscellany" recording the appearance, within hours of the complete blockage of a main line, of many of its trains, passenger and freight, on routes quite foreign to them; and of effective emergency services either side of the disaster area.”

   “He said: "Every day, thousands of unsung women and men go to work to keep London moving and to make this city better, cleaner and safer for everyone. [...]"”

2. (not-comparable)Not sung.

   “The third hymn remained unsung.”