Un‐like″ (?), a. 1. Not like; dissimilar; diverse; having no resemblance; as, the cases are unlike.
2. Not likely; improbable; unlikely.
Unlike quantities(Math.), quantities expressed by letters which are different or of different powers, as a, b, c, a2, a3, xn, and the like. — Unlike signs(Math.), the signs plus (+) and minus (-).