Unsung means deserving praise but never given it. An unsung hero, unsung and unpaid, the unsung work behind it.
It appears almost only before hero or heroes, and the image is old — deeds were once literally sung about, so what went unsung was forgotten. Note the un- prefix and sung, the past participle of sing.
1adjectiveunsungDeserving praise but never given it.
“Cleaners and porters are the unsung heroes of every hospital.”
unsung is a quality of neglect.
From un- + sung.
Etymology from Wiktionary, CC BY-SA
Practised in A Song of Ice and Fire