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Not easily relied or depended on: an undependable worker; an undependable lamp socket.
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|Noun||1.||undependability - the trait of not being dependable or reliable|
irresponsibility, irresponsibleness - a form of untrustworthiness; the trait of lacking a sense of responsibility and not feeling accountable for your actions
instability - unreliability attributable to being unstable
irreproducibility - the quality of being unreproducible; "he could not explain the irreproducibility of the results of his experiment"
fallibility - the likelihood of making errors