Something evadable can be avoided or eluded. In some scary movies, zombies move so slowly that they seem to be easily evadable.
When you successfully evade something, you either physically escape it or you avoid discussing it — either way, it's evadable. Your parents' lectures about cleaning your room might not be evadable, because there's no way to avoid them. But luckily, the neighbors' mean old dog that barks at you whenever you walk by is easily evadable because he's half blind and walks with a limp. Evadable has a Latin root that means "to escape."