WordWeb Online

1. Marked by dissimilarity
   "for twins they are very unlike"
   - dissimilar, different
    
2. Not equal in amount
   "they distributed unlike (or unequal) sums to the various charities"

1. Not similar to, different from
   "the new one is quite unlike the old one"
    
2. In contrast to
   "he's very friendly, unlike his father"
    
3. Not typical of
   "most unlike her to be late"

See also: one-sided, unequal, unlikeness

Antonym: like