Adjectives

(a)reliable, dependableworthy of reliance or trust“a reliable source of information”, “a dependable worker”
(s)dependable, honest, reliable, trueworthy of being depended on“a dependable worker”, “an honest working stiff”, “a reliable source of information”, “he was true to his word”, “I would be true for there are those who trust me”
(s)authentic, reliableconforming to fact and therefore worthy of belief“an authentic account by an eyewitness”, “reliable information”