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Use "unburnt" in a sentence
"The ordinary wooden houses, with their high sloping roofs, gradually gave place to flat-roofed huts, built of a peculiar kind of unburnt bricks, composed of mud and straw."
"Even with a small amount of unburnt tobacco clinging to it, a single cigarette butt soaked for a day is enough to turn a liter of water a sickly yellow brown and kill 50 percent of fish swimming in it."
"Every atom of carbon in gasoline must end up either as COX (CO or CO2) or as unburnt hydrocarbons (a negligible portion ends up as soot on your tailpipe or otherwise trapped in the vehicle)."