/ Dictionary / Index L lightless: Meaning and Definition of Find definitions for: light•less Pronunciation: (līt'lis), [key] — adj. without light or lights; receiving no light; dark. giving no light. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. See also: lightless (Thesaurus) lightish light line Related Content Daily Word Quiz: winsome Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language