Etymology
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unsupported (adj.)

early 15c., from un- (1) "not" + past participle of support (v.).

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Definitions of unsupported

unsupported (adj.)
not sustained or maintained by nonmaterial aid;
unsupported accusations
unsupported (adj.)
not held up or borne;
removal of the central post left the roof unsupported
From wordnet.princeton.edu