unreliable

unreliable
I
(New American Roget's College Thesaurus)
adj. untrustworthy, irresponsible, unstable, treacherous, inconstant; unsure, uncertain, fallible. See improbity, changeableness, doubt.
II
(Roget's IV) modif.
1. [Not reliable; said of persons ]
Syn. undependable, irresponsible, unstable, wavering, deceitful, tricky, shifty, furtive, underhanded, untrue, fickle, giddy, capricious, untrustworthy, vacilLating, fallible, weak, unpredictable; see also dishonest 1 , 2 .
2. [Not reliable; said of facts and objects ]
Syn. deceptive, delusive, hallucinatory, plausible, specious, tricky, unsound, untrue, inaccurate, erroneous, hollow, pretended, sham, pseudo, makeshift, meretricious, misleading.
III
(Roget's 3 Superthesaurus) a.
undependable, irresponsible, untrustworthy, unstable, fickle, changeable, capricious, *blowing hot and cold.
ANT.: reliable, dependable, trustworthy, steady
IV
(Roget's Thesaurus II) adjective 1. So weak or defective as to be liable to fail: trick, undependable. See STRONG. 2. Not to be depended on: undependable, untrustworthy. See TRUST.

English dictionary for students. 2013.

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Synonyms:
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Look at other dictionaries:

  • unreliable — I adjective capricious, changeful, deceitful, faithless, fallible, false, fickle, inconstant, insecure, irresponsible, perfidious, precarious, shifty, tergiversating, treacherous, two faced, undependable, unpredictable, unsound, unstable,… …   Law dictionary

  • Unreliable — Un re*li a*ble, a. Not reliable; untrustworthy. See {Reliable}. {Un re*li a*ble*ness}, n. [1913 Webster] Alcibiades . . . was too unsteady, and (according to Mr. Coleridge s coinage) unreliable; or perhaps, in more correct English, too… …   The Collaborative International Dictionary of English

  • unreliable — (adj.) 1840, from UN (Cf. un ) (1) not + RELIABLE (Cf. reliable). First recorded in De Quincey, who said it was coined by Coleridge …   Etymology dictionary

  • unreliable — [adj] not trustworthy, not true capricious, deceitful, deceptive, delusive, disreputable, dubious, erroneous, fake, fallible, false, fickle, fly by night*, furtive, hallucinatory, hollow, implausible, inaccurate, inconstant, irresponsible,… …   New thesaurus

  • unreliable — ► ADJECTIVE ▪ not able to be relied upon. DERIVATIVES unreliability noun unreliably adverb …   English terms dictionary

  • unreliable — [spelling only] …   English World dictionary

  • unreliable */ — UK [ˌʌnrɪˈlaɪəb(ə)l] / US adjective 1) unreliable information is not definitely true or accurate Membership figures are unreliable. 2) a) someone who is unreliable will not do what you ask them to do, or will not do it well Don t ask Jan – she s… …   English dictionary

  • unreliable — un|re|li|a|ble [ ,ʌnrı laıəbl ] adjective * 1. ) someone who is unreliable will not do what you ask them to do, or will not do it well: Don t ask Jan she s too unreliable. a ) used about things such as equipment or methods that will not work… …   Usage of the words and phrases in modern English

  • unreliable — [[t]ʌ̱nrɪla͟ɪ͟əb(ə)l[/t]] ADJ GRADED If you describe a person, machine, or method as unreliable, you mean that you cannot trust them. Diplomats can be a notoriously unreliable and misleading source of information... His judgement was unreliable …   English dictionary

  • unreliable — un|re|li|a|ble [ˌʌnrıˈlaıəbəl] adj unable to be trusted or depended on ▪ The car s becoming very unreliable. ▪ an unreliable witness …   Dictionary of contemporary English

  • unreliable — adjective unable to be trusted or depended on: The car s becoming very unreliable. | unreliable witness (=someone who may not tell the truth in a court) opposite reliable …   Longman dictionary of contemporary English

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