incompatible

Not capable of existing in agreement or harmony with something else.

Not capable of living or working together happily or harmoniously; antagonistic.

Impossible to be held simultaneously by one person.

That cannot be simultaneously true; mutually exclusive.

Producing an undesirable effect when used in combination with a particular substance.

Not immunologically compatible.

One that is incompatible.

Not compatible; incapable of harmonizing or agreeing; mutually repelling; incongruous.