/ Dictionary / Index F foolproof: Meaning and Definition of Find definitions for: fool•proof Pronunciation: (fl'prf"), [key] — adj. involving no risk or harm, even when tampered with. never-failing: a foolproof method. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. See also: foolproof (Thesaurus) foolish foolscap Related Content Daily Word Quiz: deleterious Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language