The definition of sisyphean is a task that is endless and cannot ever be completed.
(adjective)An example of a Sisyphean task is a task that will never be done no matter how long you work at it.
See Sisyphean in Webster's New World College Dictionary
adjective
Origin: < L Sisypheius < Gr Sisypheios < Sisyphos + -an
See Sisyphean in American Heritage Dictionary 4
adjective
Origin:
Origin: From Latin Sisyphēius
Origin: , from Greek Sisupheios
Origin: , from Sisuphos, Sisyphus
.