/ Dictionary / Index U unexpendable: Meaning and Definition of Find definitions for: un•ex•pend•a•ble Pronunciation: (un"ik-spen'du-bul), [key] — adj. 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. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. See also: unexpendable (Thesaurus) unexpected unexpressed Related Content Daily Word Quiz: pristine Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language