incompatibility

The state or quality of being incompatible.

Mutually exclusive or antagonistic qualities or things.

The quality or condition of being incompatible; incongruity; irreconcilableness.

The quality or state of being incompatible; inconsistency; irreconcilableness.

(immunology) the degree to which the body's immune system will try to reject foreign material (as transfused blood or transplanted tissue).