Tepefy is a word that means to warm up or heat something. The word is derived from the Latin word tepere, which means to be warm. Some antonyms for tepefy can be words such as cool, freeze, or chill. Cooling and freezing refer to making something colder, while chilling implies a similar temperature drop, but with a bit more emphasis on the coldness factor. Another antonym could be extinguish if tepefy was referring to an object in flames, as extinguishing would be the opposite action. Other antonyms might include douse, smother, pour, or submerge, depending on the context of the word.