/ Dictionary / Index S sinkless: Meaning and Definition of Find definitions for: sink•less Pronunciation: (singk'lis), [key] — adj. unsinkable, as a ship. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. sinking spell sinless 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