Etymology
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unlike (adj.)

c. 1200, "not resembling," from un- (1) "not" + like (adj.). Similar formation in Old English ungelic, Old Frisian unlik, Old Norse ulikr, Middle Danish ulige, German ungleich.

unlike (adv.)

c. 1300, "unevenly," from un- (1) "not" + like (adv.) (see like (adj.)). From 1590s as "in a manner differing."

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Definitions of unlike

unlike (adj.)
marked by dissimilarity;
for twins they are very unlike
unlike (adj.)
not equal in amount;
they distributed unlike (or unequal) sums to the various charities
From wordnet.princeton.edu