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unreliable

[uhn-ri-lahy-uh-buh l] /ˌʌn rɪˈlaɪ ə bəl/
adjective
1.
not reliable; not to be relied or depended on.
Origin
1830-1840
1830-40; un-1 + reliable
Related forms
unreliability, unreliableness, noun
unreliably, adverb
Synonyms
undependable, irresponsible, untrustworthy.
Dictionary.com Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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British Dictionary definitions for un reliable

unreliable

/ˌʌnrɪˈlaɪəbəl/
adjective
1.
not reliable; untrustworthy an unreliable witness
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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Word Origin and History for un reliable

unreliable

adj.

1840, from un- (1) "not" + reliable. First recorded in De Quincey, who said it was coined by Coleridge.

Online Etymology Dictionary, © 2010 Douglas Harper
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