reliable

/rɪˈlaɪəbl/ adjective

Definition

› able to be trusted or believed: a reliable car reliable information Andy's very reliable - if he says he'll do something, he'll do it. → Opposite unreliable

reliability

/rɪˌlaɪəˈbɪləti/ noun [U] › how reliable someone or something is: I'm not sure about the reliability of those statistics. reliably adverb › I am reliably informed that the concert has been cancelled.

(Definition of reliable adjective from the Cambridge Learner's Dictionary © Cambridge University Press)