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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5. Quilindschy Hartman - 5/10
Produced the assist for Flemming’s goal, his fifth of the season, but his defending during the final 30 minutes was really poor. Made no attempt to stop the cross for the fourth. (Photo by Mike Hewitt/Getty Images) Photo: Mike Hewitt
6. Florentino Luis - 5/10
Produced a number of important interceptions, but also guilty of making too many fouls too. Had to be replaced after picking up a booking. (Photo by Alex Pantling/Getty Images) Photo: Alex Pantling
7. James Ward-Prowse - 6/10
A level above in the first half, coming close with an awkward free kick. But it was his flick on that inadvertently fell to Gibbs-White for Forest’s equaliser. (Photo by Alex Pantling/Getty Images) Photo: Alex Pantling
8. Lesley Ugochukwu - 4/10
Largely anonymous, so it was no great surprise he was the first to be brought off. Needs to start impacting games a lot more. (Photo by Justin Setterfield/Getty Images) Photo: Justin Setterfield