/ Dictionary / Index U undecided: Meaning and Definition of Find definitions for: un•de•cid•ed Pronunciation: (un"di-sī'did), [key] — adj. not decided or determined. not having one's mind firmly made up. —n. a person who is undecided: Are you still among the undecideds? Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. See also: undecided (Thesaurus) undeceive undecillion Related Content Daily Word Quiz: procrastinate Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language