adjective. That cannot undergo mixing or blending.

Not miscible; incapable of being or becoming mixed, as oil and water.

adjective. Not capable of being mixed or mingled.

adjective. Not miscible; forming two distinct phases when mixed at some concentration; -- of two liquids.

adjective. (of two or more liquids) that are not mutually soluble; unmixable

adjective. (chemistry, physics) incapable of mixing

"There are days when I think that the two entities or disciplines are entirely immiscible and antagonistic, and others where they seem not just to complement each other but to be, in a strange way, twin enterprises."

miscible  

incompatible  

admissible  inadmissible  inexplicable  miscible  permissible  

co-located  eutectic  halogenated  ignitable  low-melting