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Definition of Sisyphean
1. Adjective. Of or relating to Sisyphus. 
2. Adjective. Both extremely effortful and futile.
Definition of Sisyphean
1. a. Relating to Sisyphus; incessantly recurring; as, Sisyphean labors.
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1. Adjective. Of or relating to Sisyphus. 
1. a. Relating to Sisyphus; incessantly recurring; as, Sisyphean labors.