/ Dictionary / Index S sinless: Meaning and Definition of Find definitions for: sin•less Pronunciation: (sin'lis), [key] — adj. free from or without sin. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. See also: sinless (Thesaurus) sinkless sinner 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