Yosil is with me now, our borders overlapping in unhappy swirls, like immiscible fluids.
-- David Brin, Kiln People, 2002
The youngest one wore its hair in a style popularized by a sitcom that took as its subject three roommates of seemingly immiscible temperaments and their attempts to make their fortune in this contusing city.
-- Colson Whitehead, Zone One, 2011
Immiscible is derived from the prefix im- which is a variant of in- meaning having a negative force, as in the words immoral and indefensible. The word miscible means "capable of being mixed" and is used primarily in chemistry and physics.