im·passibility \(|)im, əm+\noun (-es) Etymology: Middle English impassibilite, from Middle French or Late Latin; Middle French impassibilité, from Late Latin impassibilitat-, impassibilitas, from impassibilis + -itat-, -itas -ity : the quality or state of being impassible < the impassibility or aloofness she showed sometimes twoard me — Mary McCarthy >