The word "conflagrated" means to set fire or to burn violently. Some antonyms for "conflagrated" would be "extinguished" or "quenched," which mean to put out a fire or to stop the burning. Another antonym would be "unburned" or "unscathed," which means untouched by fire. Other antonyms that could be used include "doused," "smothered," or "stifled," all of which imply the same idea of stopping or preventing a fire from spreading or continuing to burn. Regardless of the antonym used, it is clear that the opposite of "conflagrated" relates to the extinguishing or preventing of fire.