What is Burning ?
Burning is (adj) 1. very hot The baby must have a temperature his face is burning. Careful, the pan is burning hot. 2. painful, as though being touched by something hot She had a burning pain in her left eye. 3. very keen He had a burning desire to go to Egypt. 4. burning question an important matter, which is likely to cause a lot of argument Who will be the new mayor, that is the burning question at the moment.
source: Easier English, Student Dictionary Upper Intermediate Level