Definitions

from The American Heritage® Dictionary of the English Language, 4th Edition

  • adj. Not alike; different: For twins, they are very unlike.
  • adj. Not equal, as in amount.
  • prep. Different from; not like: She's unlike the rest of her family.
  • prep. Not typical of: It's unlike him not to call.

from Wiktionary, Creative Commons Attribution/Share-Alike License

  • adj. Not like; dissimilar; diverse; having no resemblance.
  • adj. Unequal.
  • adj. Not likely; improbable; unlikely.
  • prep. Differently from; not in a like or similar manner.
  • prep. In contrast with.
  • v. To dislike.
  • v. To withdraw support for a particular thing, especially on social networking websites

from the GNU version of the Collaborative International Dictionary of English

  • adj. Not like; dissimilar; diverse; having no resemblance.
  • adj. Not likely; improbable; unlikely.

from The Century Dictionary and Cyclopedia

  • Not like; dissimilar; diverse; having no resemblance.
  • Not likely; improbable; unlikely.
  • Not in a like or similar manner; not like or as.

from WordNet 3.0 Copyright 2006 by Princeton University. All rights reserved.

  • adj. marked by dissimilarity
  • adj. not equal in amount

Etymologies

From Middle English unlic, unlich, from Old English unlīċ, unġelīċ ("unlike, different, dissimilar, diverse"), equivalent to un- +‎ like. (Wiktionary)
From un- +‎ like. (Wiktionary)

Examples

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