/ Dictionary / Index S seriously: Meaning and Definition of Find definitions for: se•ri•ous•ly Pronunciation: (sēr'ē-us-lē), [key] — adv. in a serious manner: He shook his head seriously. to an alarmingly grave extent: seriously ill. with genuine, earnest intent; sincerely: Seriously, kids, we have to get home before dark. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. See also: seriously (Thesaurus) serious serious-minded Related Content Daily Word Quiz: spectral Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language