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[il-di-fahynd] /ˈɪl dɪˈfaɪnd/
badly or inadequately defined; vague:
He confuses the reader with ill-defined terms and concepts.
Origin of ill-defined
First recorded in 1865-70 Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2018.
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Examples from the Web for ill-defined
Contemporary Examples
Historical Examples
  • The cloud, you mean--a dim, ill-defined, dark body of vapour?

    Homeward Bound James Fenimore Cooper
  • There was a picture of myself sitting in an ill-defined room; that was all.

    The Worlds of If Stanley Grauman Weinbaum
  • The Niuans had a belief in a future state, albeit shadowy and ill-defined.

    Savage Island Basil C. Thomson
  • It was so ill-defined that he could not trace it to its source.


    Henry Kingsley
  • Now the duties of these Native Commissioners were multifarious, if ill-defined.

  • The division between prudence and cowardice is often ill-defined.

  • They result, in great measure from the use of ill-defined terms.

  • An ill-defined feeling is very often the strongest rule of conduct.

    The Hills and the Vale Richard Jefferies
British Dictionary definitions for ill-defined


imperfectly defined; having no clear outline
Collins English Dictionary - Complete & Unabridged 2012 Digital Edition
© William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012
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