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Not easily relied or depended on: an undependable worker; an undependable lamp socket.
not able to be depended or relied upon
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|Adj.||1.||undependable - not worthy of reliance or trust; "in the early 1950s computers were large and expensive and unreliable"; "an undependable assistant"|
|2.||undependable - liable to be erroneous or misleading; "an undependable generalization"|
fallible - likely to fail or make errors; "everyone is fallible to some degree"