/ Dictionary / Index M mixed-up: Meaning and Definition of Find definitions for: mixed-up Pronunciation: (mikst'up'), [key] — adj. completely confused or emotionally unstable: a mixed-up teenager. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. See also: mixed-up (Thesaurus) mixed number mixer Related Content Daily Word Quiz: vertigo Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language