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unreliable

 - 3 dictionary results

un⋅re⋅li⋅a⋅ble

  [uhn-ri-lahy-uh-buhl]
Use unreliable in a Sentence
–adjective
not reliable; not to be relied or depended on.
Origin:
1830–40; un- 1 + reliable

Related forms:
un⋅re⋅li⋅a⋅bil⋅i⋅ty, un⋅re⋅li⋅a⋅ble⋅ness, noun
un⋅re⋅li⋅a⋅bly, adverb

Synonyms:
undependable, irresponsible, untrustworthy.
Dictionary.com Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2009.
Cite This Source Link To unreliable
un·re·li·a·ble   (ŭn'rĭ-lī'ə-bəl)   
adj.  Marked by or exhibiting a lack of reliability.
un're·li'a·bil'i·ty, un're·li'a·ble·ness n., un're·li'a·bly adv.
The American Heritage® Dictionary of the English Language, Fourth Edition
Copyright © 2009 by Houghton Mifflin Company.
Published by Houghton Mifflin Company. All rights reserved.
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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, © 2001 Douglas Harper
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