/ Dictionary / Index U unthink: Meaning and Definition of Find definitions for: un•think Pronunciation: (un-thingk'), [key] — v., -thought, -think•ing. —v.i. to end one's thought or reverse the process of thought. —v.t. to dispel from the mind: Unthink your thoughts. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. unthatch unthinkable Related Content Daily Word Quiz: spectral Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language