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:
Looked for so long he might be on for a rare clean sheet, but that disappeared in the blink of an eye. Didn’t really get near any of Forest’s four goals (Photo by Ryan Pierse/Getty Images)
1. Martin Dubravka - 4/10
Looked for so long he might be on for a rare clean sheet, but that disappeared in the blink of an eye. Didn’t really get near any of Forest’s four goals (Photo by Ryan Pierse/Getty Images) Photo: Ryan Pierse
Actually started the game well, but it’s no coincidence that both of Forest’s first two goals came down his side. Defending left a lot to be desired (Photo by Molly Darlington/Getty Images)
2. Kyle Walker - 5/10
Actually started the game well, but it’s no coincidence that both of Forest’s first two goals came down his side. Defending left a lot to be desired (Photo by Molly Darlington/Getty Images) Photo: Molly Darlington
Did well aerially and competed well up against former Claret Chris Wood, for the first 60 minutes or so at least. (Photo by Ryan Pierse/Getty Images)
3. Hjalmar Ekdal - 5/10
Did well aerially and competed well up against former Claret Chris Wood, for the first 60 minutes or so at least. (Photo by Ryan Pierse/Getty Images) Photo: Ryan Pierse
Similar to Ekdal. Defended well for the first 60 minutes, making some important blocks and headers. But then came the collapse. (Photo by Ryan Pierse/Getty Images)
4. Maxime Esteve - 5/10
Similar to Ekdal. Defended well for the first 60 minutes, making some important blocks and headers. But then came the collapse. (Photo by Ryan Pierse/Getty Images) Photo: Ryan Pierse