trusty,
trustworthy taking responsibility for one's conduct and obligations; "trustworthy public servants"
certain,
sure exercising or taking care great enough to bring assurance; "be certain to disconnect the iron when you are through"; "be sure to lock the doors"
reliable -
worthy of being depended on; "a dependable worker"; "an honest working stiff"; "a reliable sourcSFLe of information"; "he was true to his word"; "I would be true for there are those who trust me"