Despite taking the lead through Zian Flemming’s 10th goal of the campaign, the Clarets slumped to a miserable 4-1 defeat at the City Ground.
A 15-minute Morgan Gibbs-White hat-trick did the damage, before Igor Jesus piled on the misery deep into stoppage time.
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Scott Parker’s side had otherwise been well in the game against a flat and lacklustre Forest outfit, but instantly wilted as soon as the home side applied any pressure.
It means relegation could now be confirmed as early as Wednesday night, when the Clarets host Manchester City.
Here’s how Burnley’s players rated:
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13. SUB: Jacob Bruun Larsen - 5/10
For Ugochukwu, 75 Made no impact on the game. (Photo by Matt McNulty/Getty Images) Photo: Matt McNulty
14. SUB: Josh Laurent - 5/10
For Florentino, 84 As above. Photo: Kelvin Lister-Stuttard Photo: Kelvin Lister-Stuttard
15. SUB: Loum Tchaouna - 5/10
For Anthony, 84 As above. Photo: Kelvin Lister-Stuttard Photo: Kelvin Lister-Stuttard
16. SUB: Armando Broja - 5/10
For Flemming, 84 As above. (Photo by Dan Istitene/Getty Images) Photo: Dan Istitene