Related formswin·na·bil·i·ty, nounun·win·na·ble, adjective
Examples from the Web for unwinnable
Instead they squandered their post-Newtown momentum on an unwinnable negotiating position, and lost everything.
The goal was to imply Diallo had even more secrets and lies, and that the case was unwinnable in court.Five Things You Didn’t Know About DSK From John Solomon’s New Book|John Solomon|June 5, 2012|DAILY BEAST
But he is also wrong to believe Afghanistan was unwinnable from the start.
And so, newly unified, the Obama Afghanistan team will plunge deeper into an unwinnable war.
Doves generally say we must leave Afghanistan because the fight is unwinnable.