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

      

    reliable

     adjective
    adjective
    BrE BrE//rɪˈlaɪəbl//
     
    ; NAmE NAmE//rɪˈlaɪəbl//
     
    Job skills and personal qualities
     
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  1. 1that can be trusted to do something well; that you can rely on synonym dependable We are looking for someone who is reliable and hard-working. a reliable friend See related entries: Job skills and personal qualities
  2. 2that is likely to be correct or true Our information comes from a reliable source. a reliable witness How reliable are the local weather forecasts? These tests are a reliable indicator of future performance.
  3. 3able to work or operate for long periods without breaking down or needing attention My car's not as reliable as it used to be.
  4. opposite unreliable
    Word Familyrely verbreliable adjective (unreliable)reliably adverbreliability noun (unreliability)reliance nounExtra examples It has a highly reliable control system. These measurements are reliable enough for most purposes. This statement is not reliable as evidence. He was a very reliable and honest man who would never betray anyone. My car’s not as reliable as it used to be. Prosecution lawyers tried to show that she was not a reliable witness. There is no reliable supply of electricity or running water.
See the Oxford Advanced American Dictionary entry: reliable