"Prometheus Bound" is a play written by Aeschylus in ancient Greek literature. The word "Prometheus" itself means "forethought" or "forward thinking," which could be synonymous with words like "visionary," "innovative," or "pioneering." "Bound," on the other hand, implies confinement or restriction, which could be replaced with words like "imprisoned," "restricted," or "trapped." Other synonyms for "Prometheus Bound" could include "caged Prometheus," "imprisoned visionary," or "confined forward-thinker." Regardless of the exact wording used, all of these phrases evoke a sense of confinement and restriction for a powerful and innovative character.