from The American Heritage® Dictionary of the English Language, 5th Edition.

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

from The Century Dictionary.

  • Not sure; not fixed; not certain.

from Wiktionary, Creative Commons Attribution/Share-Alike License.

  • adjective uncertain of the facts
  • adjective unstable or precarious

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

  • adjective lacking self-confidence
  • adjective lacking or indicating lack of confidence or assurance


from Wiktionary, Creative Commons Attribution/Share-Alike License

un- +‎ sure


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