| Noun | 1. | Sisyphus - (Greek legend) a king in ancient Greece who offended Zeus and whose punishment was to roll a huge boulder to the top of a steep hill; each time the boulder neared the top it rolled back down and Sisyphus was forced to start againEllas, Greece, Hellenic Republic - a republic in southeastern Europe on the southern part of the Balkan peninsula; known for grapes and olives and olive oil |