unlike

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, a2, a3, xn, and the like. --
Unlike signs (Math.), the signs plus (+) and minus (-). [ 1913 Webster ]

n. Absence of likelihood. [ 1913 Webster ]

n. The quality or state of being unlikely. [ 1913 Webster ]

a. 1. Not likely; improbable; not to be reasonably expected; as, an unlikely event; the thing you mention is very unlikely. [ 1913 Webster ]

2. Not holding out a prospect of success; likely to fail; unpromising; as, unlikely means. Hooker. [ 1913 Webster ]

3. Not such as to inspire liking; unattractive; disagreeable. [ Obs. ] “The unlikely eld of me.” Chaucer. [ 1913 Webster ]

adv. In an unlikely manner. [ 1913 Webster ]

v. t. [ 1st pref. un- + liken. ] To make unlike; to dissimilate. [ Obs. ] Wyclif. [ 1913 Webster ]