/ Dictionary / Index U undemonstrative: Meaning and Definition of Find definitions for: un•de•mon•stra•tive Pronunciation: (un"du-mon'stru-tiv), [key] — adj. not given to open exhibition or expression of emotion, esp. of affection. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. See also: undemonstrative (Thesaurus) undefined undeniable Related Content Daily Word Quiz: eureka Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language