Definitions

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

  • adj. Not defined clearly or distinctly: an ill-defined concept; an ill-defined view across the foggy moor.

from Wiktionary, Creative Commons Attribution/Share-Alike License

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

from The Century Dictionary and Cyclopedia

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

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

  • adj. poorly stated or described

Etymologies

ill + defined (Wiktionary)

Examples

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