This word is acceptable for play in the US & UK dictionaries that are being used in the following games:

• Lexulous
• Wordscraper
• Wordosaur

adj. Not honored or praised; uncelebrated: an unsung hero.

adj. Not sung: unsung hymns.

adj. Which has not been lauded or appreciated.

adj. Not sung.

Not sung; not recited musically, as a song: as, “half yet remains unsung,” Not celebrated in verse or song.

adj. not famous or acclaimed

adj. having value that is not acknowledged

"With one of what I call the unsung heroes of the Unix command line, the "fold" command."

inglorious    unacknowledged   

unsung hero   

Sung    Young    among    bung    clung    dung    flung    fung    hung    lung   

unwept    unwitnessed    unhonoured    unhung    unblessed    unnamed    unpitied    unrecorded    unregretted    unloved