sisyphean

from WordNet (r) 3.0 (2006)
Sisyphean
    adj 1: of or relating to Sisyphus
    2: both extremely effortful and futile
    
from The Collaborative International Dictionary of English v.0.48
Sisyphean \Sis`y*phe"an\, a.
   Relating to Sisyphus; incessantly recurring; as, Sisyphean
   labors.
   [1913 Webster]
    

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