Sisyphean

Denoting a task that can never be completed; endlessly laborious and futile.

• (no common derivatives)

• Sisyphean task
• Sisyphean effort
• Sisyphean struggle
• Sisyphean labor

1. 1.Cleaning the house with three young children feels like a Sisyphean task — it's messy again within hours. (endlessly futile)
2. 2.The Sisyphean effort to eliminate all bugs in software is something every developer knows. (never-ending labor)

• futile/ˈfjuːtaɪl/— pointless
• interminable/ɪnˈtɜːmɪnəbəl/— endless
• unending/ʌnˈɛndɪŋ/— without end

from Greek mythology — Sisyphus was condemned to roll a boulder up a hill for eternity, only for it to roll back down each time he neared the top