un·​sustained | \ "+\

Definition of unsustained

: not sustained: such as
a obsolete : not physically sustained or supported
b : not kept up or supported by some aid leaving the station feeling empty and unsustained— S. H. Adams unsustained any longer by loans, the business failed
c : not kept or continued at a consistently high level a convolution of plots makes for unsustained interestCurrent Biography

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History and Etymology for unsustained

un- entry 1 + sustained, past participle of sustain

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not constant or steady

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