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unexpendable

[uhn-ik-spen-duh-buh l] /ˌʌn ɪkˈspɛn də bəl/
adjective
1.
essential; absolutely required:
unexpendable resources vital to our security.
2.
not capable of being expended; inexhaustible:
an unexpendable source of energy.
3.
not available for expenditure:
The principal of the trust fund is unexpendable.
Origin
Dictionary.com Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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