adjective (a)

• marked by dissimilarity(adj.all)

  Example:
  For twins they are very unlike.
  

  Synonym:
  different, dissimilar
  Antonym:
  like, similar
  

  source: wordnet30
• not equal in amount(adj.all)

  Example:
  They distributed unlike (or unequal) sums to the various charities.
  

  Antonym:
  like, same
  

  source: wordnet30
• Not like; dissimilar; diverse; having no resemblance; as, the cases are unlike.(adjective)

  source: webster1913