unreliable


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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.
American Heritage® Dictionary of the English Language, Fifth Edition. Copyright © 2016 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.

unreliable

(ˌʌnrɪˈlaɪəbəl)
adj
not reliable; untrustworthy: an unreliable witness.
Collins English Dictionary – Complete and Unabridged, 12th Edition 2014 © HarperCollins Publishers 1991, 1994, 1998, 2000, 2003, 2006, 2007, 2009, 2011, 2014
ThesaurusAntonymsRelated WordsSynonymsLegend:
Adj.1.unreliable - liable to be erroneous or misleadingunreliable - liable to be erroneous or misleading; "an undependable generalization"
fallible - likely to fail or make errors; "everyone is fallible to some degree"
2.unreliable - not worthy of reliance or trustunreliable - not worthy of reliance or trust; "in the early 1950s computers were large and expensive and unreliable"; "an undependable assistant"
untrustworthy, untrusty - not worthy of trust or belief; "an untrustworthy person"
dependable, reliable - worthy of reliance or trust; "a reliable source of information"; "a dependable worker"
3.unreliable - dangerously unstable and unpredictableunreliable - dangerously unstable and unpredictable; "treacherous winding roads"; "an unreliable trestle"
dangerous, unsafe - involving or causing danger or risk; liable to hurt or harm; "a dangerous criminal"; "a dangerous bridge"; "unemployment reached dangerous proportions"
4.unreliable - lacking a sense of responsibilityunreliable - lacking a sense of responsibility  
irresponsible - showing lack of care for consequences; "behaved like an irresponsible idiot"; "hasty and irresponsible action"
Based on WordNet 3.0, Farlex clipart collection. © 2003-2012 Princeton University, Farlex Inc.

unreliable

adjective
1. inaccurate, unconvincing, implausible, mistaken, false, uncertain, fake, deceptive, erroneous, unsound, fallible, specious, delusive The figures were unreliable because the sample sizes were too small.
inaccurate accurate, infallible
2. undependable, irresponsible, untrustworthy, unstable, treacherous, disreputable, not conscientious She had proved to be an unreliable witness and had lied to police.
undependable reliable, dependable, trustworthy, responsible, stable, conscientious
Collins Thesaurus of the English Language – Complete and Unabridged 2nd Edition. 2002 © HarperCollins Publishers 1995, 2002

unreliable

adjective
1. So weak or defective as to be liable to fail:
2. Not to be depended on:
The American Heritage® Roget's Thesaurus. Copyright © 2013, 2014 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.
Translations
nespolehlivý
upålidelig
epäluotettava
nepouzdan
あてにならない
신뢰할 수 없는
nezanesljiv
opålitlig
ไว้ใจไม่ได้
không đáng tin cậy

unreliable

[ˈʌnrɪˈlaɪəbl] ADJ [person] → informal, poco de fiar; [machine, service] → poco fiable, que no es de fiar; [information, statistics] → poco fiable; [weather, climate] → variable, inestable
they thought British workers were unreliableopinaban que a los trabajadores británicos les faltaba formalidad, opinaban que los trabajadores británicos eran muy informales or no eran muy de fiar
the phones here are unreliablelos teléfonos aquí son poco fiables or no son de fiar
my memory is so unreliable these daysmi memoria no es muy de fiar últimamente
Collins Spanish Dictionary - Complete and Unabridged 8th Edition 2005 © William Collins Sons & Co. Ltd. 1971, 1988 © HarperCollins Publishers 1992, 1993, 1996, 1997, 2000, 2003, 2005

unreliable

[ˌʌnrɪˈlaɪəbəl] adj
[person] → sur qui on ne peut pas compter, peu fiable
He's completely unreliable → On ne peut pas du tout compter sur lui.
[car, machine] → peu fiable; [method, judgement] → peu fiable
It's a nice car, but a bit unreliable → C'est une belle voiture, mais elle n'est pas très fiable.
[evidence] → insuffisant(e)
to acquit due to unreliable evidence → acquitter faute de preuves concluantes
Collins English/French Electronic Resource. © HarperCollins Publishers 2005

unreliable

adjunzuverlässig; to prove (to be) unreliablesich als unzuverlässig erweisen
Collins German Dictionary – Complete and Unabridged 7th Edition 2005. © William Collins Sons & Co. Ltd. 1980 © HarperCollins Publishers 1991, 1997, 1999, 2004, 2005, 2007

unreliable

[ˌʌnrɪˈlaɪəbl] adj (person) → su cui non si può contare or fare affidamento; (source) → inattendibile; (firm) → poco serio/a; (car, machine) → che non dà affidamento
Collins Italian Dictionary 1st Edition © HarperCollins Publishers 1995

unreliable

لا يـُمْكِنُ الاِعْتِمَادُ عَلَيْه nespolehlivý upålidelig unzuverlässig αναξιόπιστος informal epäluotettava imprévisible nepouzdan inaffidabile あてにならない 신뢰할 수 없는 onbetrouwbaar upålitelig zawodny não confiável, não fiável ненадежный opålitlig ไว้ใจไม่ได้ güvenilmez không đáng tin cậy 不可靠的
Multilingual Translator © HarperCollins Publishers 2009
References in classic literature ?
Our music consisted of the well-mixed strains of a melodeon which was a little asthmatic and apt to catch its breath where it ought to come out strong, a clarinet which was a little unreliable on the high keys and rather melancholy on the low ones, and a disreputable accordion that had a leak somewhere and breathed louder than it squawked--a more elegant term does not occur to me just now.
For however eagerly and impetuously the savage crew had hailed the announcement of his quest; yet all sailors of all sorts are more or less capricious and unreliable --they live in the varying outer weather, and they inhale its fickleness --and when retained for any object remote and blank in the pursuit, however promissory of life and passion in the end, it is above all things requisite that temporary interests and employment should intervene and hold them healthily suspended for the final dash.
MALAYAN ARCHIPELAGO--Lights unreliable owing eruptions.
It will be remembered that the obstinate fellow had insisted on keeping his famous family watch at London time, and on regarding that of the countries he had passed through as quite false and unreliable. Now, on this day, though he had not changed the hands, he found that his watch exactly agreed with the ship's chronometers.
"I mean Man," said Father Brown, "the most unreliable machine I know of.
All the friends of the family suddenly became unreliable people, for the first time in their lives.
Well, she might have been twelve then: it was so long ago and the Vicar was always so unreliable. They said it was twenty years ago, but people used round figures, and it was just as likely to be eighteen years, or seventeen.
The first sensation of rapid transit doubtless came with the sailing vessel; but it was the play-toy of the winds, and unreliable. When Columbus dared to set out on his famous voyage, he was five weeks in crossing from Spain to the West Indies, his best day's record two hundred miles.
Beyond them stood the unreliable Signora, bowing good-evening to her guests, and supported by 'Enery, her little boy, and Victorier, her daughter.
The color is hideous enough, and unreliable enough, and infuriating enough, but the pattern is torturing.
He appealed to the Judges to say whether such loose and unreliable evidence as this was evidence which could be received by the Court.
Indeed, with all his dignity of a man of the world, Prince Saradine radiated to such sensitive observers as the priest, a certain atmosphere of the restless and even the unreliable. His face was fastidious, but his eye was wild; he had little nervous tricks, like a man shaken by drink or drugs, and he neither had, nor professed to have, his hand on the helm of household affairs.