not spent or used, as money.
not used up or consumed: unspent energy.

1425–75; late Middle English; see un-1, spent

Dictionary.com Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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Example sentences
Deficits are financed by borrowing money that would otherwise be unspent.
The cuts will not halt the rail program since unspent money remains that can be
  used on new projects.
And while the results of last year's rebate seem to have been somewhat more
  encouraging, much of it still went unspent.
It is conceivable that the economy could recover so quickly that unspent
  stimulus money isn't needed.
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