21 on fire synonyms include burning, ablaze, blazing, aflame, in flames, flaming, raging, fiery, alight, and lit. On fire is an adjective, and its antonyms are extinguished and cold. Here are some additional synonyms for "on fire" with example sentences.
21 other ways to say on fire.
He felt his heart on fire.
My enthusiasm for learning is on fire!
The building was suddenly on fire.