|sisə|fēən adjective
or si·syph·i·an sə̇ˈsifēən
Usage: usually capitalized
Etymology: Latin sisyphe ius, sisyphi us sisyphean (from Greek sisypheios, sisyphios, from Sisyphos Sisyphus, in Greco-Roman mythology the cruel king of Corinth whose punishment in Hades was to roll up a hill a heavy stone that constantly rolled down again) + English -an
: of, relating to, or suggestive of the labors of Sisyphus ; specifically : requiring continual and often ineffective effort
would go back to the National Assembly for rereading and repassage, a Sisyphean task — Janet Flanner