/ Dictionary / Index D dreadfully: Meaning and Definition of Find definitions for: dread•ful•ly Pronunciation: (dred'fu-lē), [key] — adv. in a dreadful way: The pain has increased dreadfully. very; extremely: Sorry to be so dreadfully late. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. See also: dreadfully (Thesaurus) dreadful dreadlocks Related Content Daily Word Quiz: agitated Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language