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That cannot undergo mixing or blending: immiscible elements.
(of two or more liquids) incapable of being mixed to form a homogeneous substance: oil and water are immiscible.
im•mis•ci•ble(ɪˈmɪs ə bəl)
not miscible; incapable of being mixed.
Incapable of being mixed or blended together. Immiscible liquids that are shaken together eventually separate into layers. Oil and water are immiscible.
Describes substances which do not mix and form more than one phase when brought together.