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From The Collaborative International Dictionary of English v.0.48:
Unreliable \Un`re*li"a*ble\, a. Not reliable; untrustworthy. See Reliable. -- Un`re*li"a*ble*ness, n. [1913 Webster] Alcibiades . . . was too unsteady, and (according to Mr. Coleridge's coinage) "unreliable;" or perhaps, in more correct English, too "unrelyuponable." --De Quincey. [1913 Webster]