/ Dictionary / Index S slily: Meaning and Definition of Find definitions for: sli•ly Pronunciation: (slī'lē), [key] — adv. slyly. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. Sligo slim Related Content Daily Word Quiz: cetacean Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language