un·de·fined

[uhn-di-fahynd]
adjective
1.
without fixed limits; indefinite in form, extent, or application: undefined authority; undefined feelings of sadness.
2.
not given meaning or significance, as by a definition; not defined or explained: an undefined term.

Origin:
1605–15; un-1 + defined

un·de·fin·ed·ly [uhn-di-fahy-nid-lee, -fahynd-] , adverb
un·de·fin·ed·ness, noun
Dictionary.com Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2013.
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Collins
World English Dictionary
undefined (ˌʌndɪˈfaɪnd) [Click for IPA pronunciation guide]
 
adj
not defined or made clear: the job has remained undefined
 
unde'finable
 
adj

Collins English Dictionary - Complete & Unabridged 10th Edition
2009 © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009
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00:10
Undefined is always a great word to know.
So is bezoar. Does it mean:
a calculus or concretion found in the stomach or intestines of certain animals, esp. ruminants, formerly reputed to be an effective remedy for poison.
an extraordinary or unusual thing, person, or event; an exceptional example or instance.
Etymonline
Word Origin & History

undefined
1611, from un- (1) "not" + pp. of define (v.).
Online Etymology Dictionary, © 2010 Douglas Harper
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Example sentences
And the etiology for this mental disorder was often undefined.
If a thread terminates while it has ownership of a critical section, the state
  of the critical section is undefined.
Despite its fierce campaign of violence, the group has an undefined structure
  and no clear chain of command.
Similarly, the use of undefined pronouns is irksome when they refer to an
  earlier message.
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