Unlike /(?)/

Un·like

Unlike

a.
  1. Not like; dissimilar; diverse; having no resemblance; as, the cases are unlike.
  2. Not likely; improbable; unlikely. [Obsoles.]

Phrases & Compounds
Unlike quantities
quantities expressed by letters which are different or of different powers, as a, b, c, a2, a3, xn, and the like.
Unlike signs
the signs plus (+) and minus (-).