Home › Words › U › unburnunburnunburn means to undergo the process of burning in reverse.Among words judged in Lexicurio's Arena, unburn ranks #8,612 of 42,747 for Qualifying.EtymologyFrom un- + burn.verbTo undergo the process of burning in reverse.e.g.“Similarly, you cannot 'unstir' the sugar from a cup of coffee once it has been dissolved, and you never see a pile of ash in the fireplace 'unburn' to become a log of wood again.” — 2002, Jim Al-Khalili, Black Holes, Wormholes and Time Machines, page 122:Definitions & examples from Wiktionary (CC BY-SA 3.0).