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

  

unreliable

 adjective
adjective
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