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Marked by or exhibiting a lack of reliability.
un′re·li′a·bil′i·ty, un′re·li′a·ble·ness n.
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|Noun||1.||unreliableness - 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