un·re·li·a·ble

[uhn-ri-lahy-uh-buhl]
adjective
not reliable; not to be relied or depended on.

Origin:
1830–40; un-1 + reliable

un·re·li·a·bil·i·ty, un·re·li·a·ble·ness, noun
un·re·li·a·bly, adverb


undependable, irresponsible, untrustworthy.
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Based on the Random House Dictionary, © Random House, Inc. 2013.
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World English Dictionary
unreliable (ˌʌnrɪˈlaɪəbəl) [Click for IPA pronunciation guide]
 
adj
not reliable; untrustworthy: an unreliable witness

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
Unreliable is always a great word to know.
So is bezoar. Does it mean:
an extraordinary or unusual thing, person, or event; an exceptional example or instance.
a calculus or concretion found in the stomach or intestines of certain animals, esp. ruminants, formerly reputed to be an effective remedy for poison.
Etymonline
Word Origin & History

unreliable
1840, from un- (1) "not" + reliable. First recorded in De Quincey, who said it was coined by Coleridge.
Online Etymology Dictionary, © 2010 Douglas Harper
Cite This Source
Example sentences
Everyone has heard that memories can be unreliable, but many of us don't
  appreciate the extent to which that is true.
Likewise, it makes no sense to site nuclear power plants where water supplies
  are scarce or unreliable.
Unsociable hours meant that local workers' attendance was unreliable.
Data-heavy voice calls are still unreliable, but text messages get through
  without trouble.
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