/ Dictionary / Index S sunless: Meaning and Definition of Find definitions for: sun•less Pronunciation: (sun'lis), [key] — adj. lacking sun or sunlight; dark: a sunless room. dismal; gloomy; cheerless: a sunless smile. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. See also: sunless (Thesaurus) sunlamp sun letter Related Content Daily Word Quiz: neologism Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language