futile
unable to produce a useful result
Root
- fund / fus: pour, pour out, or melt into a flow
Other words with the fund / fus root
Futile keeps the leaky-vessel picture: effort pours out before it can become a result.
Arguing with the broken timer was futile; it could not hear her.
Futile is not just hard. It is effort with no useful purchase: like trying to fill a vessel that leaks as fast as you pour.