/ Dictionary / Index D dullish: Meaning and Definition of Find definitions for: dull•ish Pronunciation: (dul'ish), [key] somewhat dull; tending to be dull. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. Dulles International Airport Dull Knife Related Content Daily Word Quiz: lyceum Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language