/ Dictionary / Index U unnecessary: Meaning and Definition of Find definitions for: un•nec•es•sar•y Pronunciation: (un-nes'u-ser"ē), [key] — adj., n., pl. -sar•ies. —adj. not necessary or essential; needless; unessential. —n. things that are not necessary or essential. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. See also: unnecessary (Thesaurus) unnatural unnerve Related Content Daily Word Quiz: inutiae Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language