/ Dictionary / Index S sliest: Meaning and Definition of Find definitions for: sli•est Pronunciation: (slī'ist), [key] — adj. a superlative of Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. See also: sliest (Thesaurus) slier slight Related Content Daily Word Quiz: paradox Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language