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

  • adjective Not defined clearly or distinctly.

from The Century Dictionary.

  • Not distinct; not well marked out: as, an ill-defined sensation; specifically, in zoology, without definite borders: said of marks, depressions, etc.

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

  • adjective Poorly defined; blurry, out of focus; lacking a clear boundary.

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

  • adjective poorly stated or described


from Wiktionary, Creative Commons Attribution/Share-Alike License

ill + defined


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