Definition of unreliable in US English:

unreliable

adjective

  • Not able to be relied upon.

    ‘he's lazy and unreliable’
    ‘unreliable information’
    • ‘The evidence for them was far too unreliable to have any credibility.’
    • ‘But worst of all the judge's ruling makes a martyr out of a thoroughly unreliable journalist.’
    • ‘Dozens of patients had their operations postponed because of the unreliable operating tables.’
    • ‘My body feels older somehow, like a battered and slightly unreliable car.’
    • ‘Such knowledge as management did possess was vague or unreliable and seldom committed to writing.’
    • ‘Research has shown, however, that recall is unreliable and rife with inaccuracies and biases.’
    • ‘It is difficult to blame people for spending holidays abroad, when the weather here is so unreliable.’
    • ‘Then, it was accepted that a new car would be unreliable and poorly made.’
    • ‘The July meeting which should have been held in a garden was again inside due to the unreliable summer weather.’
    • ‘The traders had complained the system was unreliable and said they had no proof that it had discouraged crime.’
    • ‘However, sundials are a surprisingly unreliable means of telling the time.’
    • ‘But word of mouth is often unreliable and by the time they reached town, all supplies had run out.’
    • ‘A few curse the memory of them as clunky, unstable, slow, unreliable and inherently unsafe.’
    • ‘It says the numbers would be too unreliable because relatives would not contact them if their loved ones had been found.’
    • ‘By contrast the state markets were unreliable with regard to delivery times, quality, and choice.’
    • ‘These creatures have the reputation of being smelly, vicious, spiteful and unreliable.’
    • ‘What a pity that Ms Evans' information comes from such an unreliable source.’
    • ‘The Railtrack work has to continue, and that makes for unreliable timetables.’
    • ‘The experience of abuse often makes people difficult, all too easy to smear as unreliable witnesses.’
    • ‘For we will not be able to continue if we are unaffordable, or unreliable in broad terms.’
    undependable, untrustworthy, irresponsible, reckless, fickle, capricious, irregular, erratic, unpredictable, inconstant, mutable, faithless, untrue, flighty, slippery
    questionable, open to question, open to doubt, doubtful, dubious, suspect, unsound, tenuous, flimsy, weak, unsubstantial, implausible, unconvincing, unsupported, unsubstantiated, fallible, shaky, rocky
    View synonyms

Pronunciation

unreliable

/ˌənrəˈlaɪəb(ə)l//ˌənrəˈlīəb(ə)l/