【Reliable】 , 【dependable】 ,  【trustworthy】 ,  【trusty】 ,  【tried】  can be applied to persons, their utterances, views, methods, or instruments to mean having or manifesting qualities which merit confidence or trust.

【Reliable】 describes what one can count upon not to fail in doing what is expected or to give or tell the exact truth.

【Dependable】  is very close to  【reliable】 ; it may suggest steadiness or trustworthiness in time of need or in an emergency.

【Dependable】 is also used merely as a descriptive term implying a character that is predictable or that is the antithesis of what is fickle or capricious.

A person or occasionally a thing is  【trustworthy】 that merits or has earned one′s complete confidence in his or its soundness, integrity, veracity, discretion, or reliability.

【Trusty】 applies to a person or thing that has been found by experience to be 【reliable】 and 【trustworthy】 or that has been found never to have failed one in need or in an emergency or that has been found 【dependable】 whenever needed.

【Tried】 also stresses proved reliability, dependability, trustworthiness, or trustiness.