Meaning of “reliable” - Learner’s Dictionary

reliable

adjective us uk /rɪˈlaɪəbl/
I need a car that's economical and reliable.With some goods, cost is the most reliable indicator of quality.The latest version of the software is much more reliable than the original.The information came from a reliable source.The train service is not very reliable.

B1 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 noun [ U ] us uk /rɪˌlaɪəˈbɪləti/

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” from the Cambridge Learner’s Dictionary © Cambridge University Press)