unreliable
adjective
un·re·li·able
ˌən-ri-ˈlī-ə-bəl
: not reliable : undependable, untrustworthy
an unreliable friend
an unreliable source of funding
an unreliable car
unreliability
noun
the unreliability of the data
a person with a reputation for unreliability
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Merriam-Webster unabridged
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