Not compatible; incapable of harmonizing or agreeing; mutually repelling; incongruous.Specifically That cannot coexist or be conjoined, as mutually repellent substances, or ingredients in a medicine which react on each other, causing precipitation or serious change of composition, or remedies which have opposite medicinal properties. Such substances are distinctively called incompatibles.Persons or things that are incompatible with each other. See I., 2.