Si·syp·he·an

Relating to a task that can never be completed.

One that requires continuous effort but never leads to success or completion.

"Running Wordixon is Sisyphean."

The term is derived from the Greek myth of Sisyphus, who was condemned to roll a boulder uphill only for it to roll back down each time.

Endless · Futile · Unending · Pointless

From the myth of Sisyphus, a figure in Greek mythology punished to an eternal, pointless labor.