Related formscoun·ter·fact, nouncoun·ter·fac·tu·al·ly, adverb
Examples from the Web for counterfactual
Psychologists call this awareness of what might have been “counterfactual thinking.”What’s a Key to Victory in Sochi? Coming So Close to Defeat.|Kevin Bleyer|February 23, 2014|DAILY BEAST
His counterfactual musings don't provide any practicable, coherent or implementable alternatives.
But let's consider a counterfactual: Republicans double down.
It will depend upon the counterfactual—who is the other person.