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

  • adj. Lacking confidence.
  • adj. Uncertain of the facts.
  • adj. Precarious; unstable; unreliable.

from Wiktionary, Creative Commons Attribution/Share-Alike License

  • adj. uncertain of the facts
  • adj. unstable or precarious

from The Century Dictionary and Cyclopedia

  • Not sure; not fixed; not certain.

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

  • adj. lacking self-confidence
  • adj. lacking or indicating lack of confidence or assurance


un- +‎ sure (Wiktionary)



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