Incendiary

1. noun

   a bomb that is designed to start fires; is most effective against flammable targets (such as fuel)

   Similar: incendiary bomb, firebomb

2. adjective

   capable of catching fire spontaneously or causing fires or burning readily

   “an incendiary agent”

3. noun

   a criminal who illegally sets fire to property

   Similar: arsonist, firebug

4. adjective

   involving deliberate burning of property

   “an incendiary fire”