WordNet (r) 3.0 (2006):
undependable adj 1: not worthy of reliance or trust; "in the early 1950s computers were large and expensive and unreliable"; "an undependable assistant" [syn: unreliable, undependable] [ant: dependable, reliable] 2: liable to be erroneous or misleading; "an undependable generalization" [syn: undependable, unreliable]