unattributable
adjective
un·at·trib·ut·a·ble
ˌən-ə-ˈtri-ˌbyü-tə-bəl
-byə-
: not able to be ascribed or credited to a source : not capable of being attributed
an unattributable rumor
unattributable liabilities
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Merriam-Webster unabridged
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