Sisyphean
adjective /ˌsɪsɪˈfiːən/
/ˌsɪsɪˈfiːən/
- (of a task) impossible to completeWord OriginFrom the Greek myth in which Sisyphus was punished for the bad things he had done in his life with the never-ending task of rolling a large stone to the top of a hill, from which it always rolled down again.