/ Dictionary / Index S slack-jawed: Meaning and Definition of Find definitions for: slack-jawed Pronunciation: (slak'jôd'), [key] — adj. having the mouth open, esp. as an indication of astonishment, bewilderment, etc. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. slacker slacks 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