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 interest — Current Biography
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Origin and Etymology of unsustained
1un- + sustained, past participle of sustain
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