unreliable - definition and synonyms

 
adjective 

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/ˌʌnrɪˈlaɪəb(ə)l/
  1. 2
    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.

    1. a.
      things such as equipment or methods that are unreliable will not work without problems

      The car’s unreliable in wet weather.