Definitions

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

Etymologies

from Wiktionary, Creative Commons Attribution/Share-Alike License

ill + defined

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Examples

  • But the term is ill-defined, so explain references to it in earnings articles and also include net income, the figure required by the SEC and accountants.

    Essential Guide to Business Style and Usage PAUL R. MARTIN 2002

  • But the term is ill-defined, so explain references to it in earnings articles and also include net income, the figure required by the SEC and accountants.

    Essential Guide to Business Style and Usage PAUL R. MARTIN 2002

  • We along with the PSOne camp can't fathom playing a game that's simple, without competitive elements, or lacking in some ill-defined sense of substance.

    Wii Music, Coda SVGL 2009

  • In the search for answers, there is no reason to stop at M-theory, which is not strictly speaking a theory at all but an ill-defined speculation about how string theory, itself a speculation about quantum gravity, may cohere.

    Clay Farris Naff: Are We The Reason For The Universe's Existence? The Anthropic Principle Reconsidered Clay Farris Naff 2012

  • It might help, at least, to stop applying this ill-defined term to anyone who works, unpaid, for longer than three weeks.

    Sure, you can 'work'. Just don't expect a job at the end of it | Catherine Bennett 2012

  • "We have more than 100,000 troops in Afghanistan risking life and limb, at a cost of $10 billion a month, to pursue ill-defined goals whose achievement" can only barely be imagined.

    Terence Smith: Two Good Columns Terence Smith 2011

  • In the search for answers, there is no reason to stop at M-theory, which is not strictly speaking a theory at all but an ill-defined speculation about how string theory, itself a speculation about quantum gravity, may cohere.

    Clay Farris Naff: Are We The Reason For The Universe's Existence? The Anthropic Principle Reconsidered Clay Farris Naff 2012

  • Don´t cross that often ill-defined "macho" line or do so at your peril.

    Page 2 2009

  • In other words having a real-world, timely-measurable, good impact on a group of people for whom their problems and the relevance of technologies for solutions are open and ill-defined questions at the beginning of study, raises significant challenges and ones that seem at odds with the ways that Computer Science does disciplinary business.

    Reflections on ICT4D « Beki's Blog (there's an original name) 2009

  • We could see now, as we had not a few short weeks earlier when Henry first began behaving strangely, that mental illness was a mysterious, ill-defined disorder, wholly different from physical ills like tuberculosis or cholera, which could be cured with the right medicine.

    Henry’s Demons Patrick Cockburn 2011

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