/ Dictionary / Index H heedless: Meaning and Definition of Find definitions for: heed•less Pronunciation: (hēd'lis), [key] — adj. careless; thoughtless; unmindful: Heedless of the danger, he returned to the burning building to save his dog. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. See also: heedless (Thesaurus) heedful heehaw Related Content Daily Word Quiz: stringent Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language