/ Dictionary / Index S simpleton: Meaning and Definition of Find definitions for: sim•ple•ton Pronunciation: (sim'pul-tun), [key] — n. an ignorant, foolish, or silly person. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. See also: simpleton (Thesaurus) simple time simple transcendental extension 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