Synonyms of the word

unmixable

• adj. Not mixable, not able to mix.

immiscible

• adj. (physics) (of two or more liquids) that are not mutually soluble; unmixable.

incompatible

• adj. Of two things: that cannot coexist; not congruous because of differences; irreconcilable; disagreeing.
• adj. (chemistry) Incapable of being together without mutual reaction or decomposition, as certain medicines.
• n. (medicine, chemistry, chiefly in the plural) An incompatible substance; one of a group of things that…
• n. (philosophy) A consequent of a contrary.