/ Dictionary / Index H horizonless: Meaning and Definition of Find definitions for: ho•ri•zon•less Pronunciation: (hu-rī'zun-lis), [key] — adj. lacking or without a horizon. without hope; hopeless. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. horizon distance horizontal Related Content Daily Word Quiz: pundit Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language