Definition of unreliable adjective from the Oxford Advanced Learner's Dictionary



BrE BrE//ˌʌnrɪˈlaɪəbl//
; NAmE NAmE//ˌʌnrɪˈlaɪəbl//
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that cannot be trusted or depended on The trains are notoriously unreliable. He's totally unreliable as a source of information. opposite reliableWord Familyrely verbreliable adjective (unreliable)reliably adverbreliability noun (unreliability)reliance noun
See the Oxford Advanced American Dictionary entry: unreliable