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From The Collaborative International Dictionary of English v.0.48:
Unlike \Un*like"\, a. 1. Not like; dissimilar; diverse; having no resemblance; as, the cases are unlike. [1913 Webster] 2. Not likely; improbable; unlikely. [Obsoles.] [1913 Webster] Unlike quantities (Math.), quantities expressed by letters which are different or of different powers, as a, b, c, a^2, a^3, x^n, and the like. Unlike signs (Math.), the signs plus (+) and minus (-). [1913 Webster]