[ uhn-ik-spen-duh-buh l ]
/ ˌʌn ɪkˈspɛn də bəl /
essential; absolutely required: unexpendable resources vital to our security.
not capable of being expended; inexhaustible: an unexpendable source of energy.
not available for expenditure: The principal of the trust fund is unexpendable.
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2019
Examples from the Web for unexpendable
Their wickedness grows out of their wonderful stores of unexpended and unexpendable energy.The Idiot at Home|John Kendrick Bangs