"Conflagrant" is an adjective that describes something that is burning or on fire. Antonyms for this word are words that describe the opposite meaning, such as "cold", "extinguished", "quenched", and "chilled". When something is cold, it is at the opposite end of the temperature spectrum than something that is conflagrant. Extinguished refers to the act of putting out the flames, thus ending a conflagration. Quenched is also a word that implies extinguishing, and chilled means something is cool or frozen. All these antonyms provide a contrast to the intense and fiery nature of a conflagrant object.