RELIABLE

[adjective]Something that is reliable can be trusted because it works well.Is your watch reliable?My car is seven years old but it's still fairly reliable.We have it on reliable evidence (= We have been told by someone who can be trusted) that there are plans to build a road here. Someone who is reliable can be trusted because they always behave well and in the way you expect.John is very reliable - if he says he'll do something he'll do it.