Breadcrumb Home > 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 TrendingHere are the facts and trivia that people are buzzing about. Hanukkah Origins of the Christmas Holiday Jewish Holidays, 2010-2030 (A.M. 5770-5791) Western Christian Holidays, 2010-2030 Krampus: The Christmas Devil Kwanzaa ✖ Related Content Daily Word Quiz: oungurk Analogy of the Day: Today’s Analogy Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language