- Of two things: impossible to coexist; not congruous because of differences; irreconcilable; disagreeing.
- (chemistry) Incapable of being together without mutual reaction or decomposition, as certain medicines.
incompatible (plural incompatibles)
- (medicine, chemistry, chiefly in the plural) An incompatible substance; one of a group of things that cannot be placed or used together because of a change of chemical composition or opposing medicinal qualities.
- the incompatibles of iron