Definition of Sisyphean adjective from the Oxford Advanced American Dictionary

 

Sisyphean

 adjective
adjective
NAmE//ˌsɪsəˈfiən//
 
 
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(of a task) impossible to complete From 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.
See the Oxford Advanced Learner's Dictionary entry: Sisyphean