The phrase "bursted forth" suggests a sudden and explosive movement or release of energy. Antonyms for this phrase could include "trickled out," "dribbled," or "oozed." These words convey a slower and more controlled flow of movement, as opposed to the sudden burst of the original phrase. Other antonyms could include "restrained," "held back," or "contained." These words suggest a sense of control and even suppression, opposite to the uncontrollable force implied by "bursted forth." Ultimately, choosing the right antonym for "bursted forth" depends on the context and overall tone of the writing.